The 20 Best Outdoor Post Solar Lights of 2026

Item Model Number: B09N6YZD33

Pack Size: 6 caps

Product Dimensions: 5.8 x 5.8 x 3.2 inches per unit

Weight: 4.17 pounds (full set)

Fit: 4x4 vinyl or wooden posts

Color Modes: 2 selectable lighting modes

Shell Color: Black

Power Source: 100 percent solar powered, batteries included

Installation: Cap-style, fits directly over post top

Brand: Dynaming

Recommended Use: Fence, deck, garden, patio, gate posts

The Dynaming Solar Post Cap Lights are a 6-pack of solar-powered cap lights built specifically for 4x4 vinyl or wooden fence and deck posts. They're designed for homeowners who want simple, functional lighting on top of existing posts without running wiring or dealing with complicated installation.

The core feature set is straightforward and effective: 2 selectable color modes give some flexibility in lighting tone, while upgraded LED brightness improves on the dim output that affects many basic post cap lights. The black shell design is intentionally versatile, blending well with a wide range of fence, deck, and patio color schemes rather than standing out as an obvious add-on. Being purpose-built for 4x4 posts means the cap fits snugly and securely, an important detail for a product that sits exposed to wind and weather on top of a post.

Market data shows this listing performing strongly within its category, ranking near the top of best-selling 4x4 solar post cap lights with an estimated 2,000 monthly unit sales and a rating around 4.4 out of 5, both solid signals of consistent, real-world satisfaction. Installation is simple: the cap fits directly over the top of a standard 4x4 post, requiring no wiring, drilling, or professional help to set up.

The main limitation is sizing. These caps are made specifically for 4x4 posts, so anyone with 5x5 or 6x6 fence or deck posts will need to look at a different Dynaming listing or use a separate mount base adapter, which the brand also sells. As with all solar lighting, actual brightness and nightly runtime will vary based on how much direct sun each post receives throughout the day, and the 2-mode design, while functional, offers less variety than higher-end RGB or multi-mode competitors.

Overall, this is a dependable, well-reviewed choice for anyone with standard 4x4 fence or deck posts who wants clean, no-wiring cap lighting. The combination of proven sales performance, a strong rating, and simple installation make it a solid pick for finishing off a fence line or deck perimeter.

Before ordering, measure your posts to confirm they are true 4x4 vinyl or wooden posts, since this cap is sized specifically for that dimension and will not fit 5x5 or 6x6 posts without a separate adapter.

Install each cap in a location that gets consistent daily sunlight, since brightness and nightly runtime depend on how much charge the solar panel collects during the day.

If you later expand your fence or deck and need additional coverage, Dynaming offers matching post cap lights in other pack sizes and post-size variants, making it easy to keep a consistent look across a larger perimeter.

Brand: Mlambert

Pack size: 16 lights

Material: Durable ABS plastic

Finish: Matte black

Light color: Dual-tone, warm white (3200K) and cool white (6000K), switchable

Post compatibility: 4x4 vinyl posts, 3.5x3.5 wood posts (NOT compatible with 5x5, 6x6, or other sizes)

Waterproof rating: IP44

Solar technology: Upgraded solar panels with high-capacity rechargeable batteries for cloudy-day performance

Installation: Tool-free, no wiring required

Power source: Solar powered

Recommended use: Fence, garden, deck, and patio

The Mlambert 4x4 Solar Post Cap Lights Outdoor 16 Pack is a fence and deck lighting solution built around genuine color customization, letting buyers switch between two distinct lighting moods depending on the occasion. It's designed for fences, gardens, decks, and patios where both function and adjustable ambiance matter.

The standout feature is the dual-temperature LED technology, allowing users to choose between warm white light at 3200K for a cozy, inviting atmosphere suited to intimate gatherings, or cool white light at 6000K for bright, crisp visibility better suited to functional and security-oriented lighting. This flexibility means the same fixture can serve two different lighting purposes without needing to buy separate warm-only and cool-only products.

Charging reliability is another area of focus, with Mlambert highlighting upgraded solar panels paired with high-capacity rechargeable batteries specifically designed to optimize energy collection even during cloudy days, addressing a common frustration with basic solar lights that underperform in less-than-ideal sun conditions.

Build quality centers on durable ABS plastic construction finished in a sleek matte black that's designed to resist rain, snow, and UV exposure without fading over time, backed by an IP44 waterproof rating suitable for year-round outdoor use. The minimalist black aesthetic is intentionally versatile, designed to complement a range of outdoor decor styles, including modern, rustic, farmhouse, and traditional settings.

Installation is designed to be genuinely tool-free and wire-free, making setup accessible regardless of DIY experience level. With 16 lights included, this set offers substantial coverage for a full fence line or deck perimeter in a single purchase.

The main limitation to note carefully before purchasing is post compatibility: these caps are specifically sized for 4x4 vinyl posts or 3.5x3.5 wood posts only, and explicitly do not fit 5x5, 6x6, or other post sizes, so buyers should measure their existing posts before ordering. The IP44 waterproof rating is also more basic than the IP65 or higher ratings found on some premium competing post cap lights, and as with all solar lighting, actual performance will still depend on adequate direct sunlight reaching each panel.

Overall, this is a strong choice for buyers with correctly sized 4x4 vinyl or 3.5x3.5 wood posts who want genuine warm-to-cool lighting flexibility and improved cloudy-day charging performance, backed by a durable, fade-resistant black finish that suits a wide range of outdoor styles.

Post size compatibility is the single most important spec to verify before purchasing solar post cap lights, since a mismatch will mean the caps simply won't fit. This Mlambert set is specifically designed for 4x4 vinyl posts or 3.5x3.5 wood posts only, explicitly excluding 5x5, 6x6, and other common sizes, so measure your actual posts carefully before ordering.

Color temperature flexibility is a genuinely valuable feature to look for if you want your fence or deck lighting to serve more than one purpose. Dual-tone options, like this set's switchable warm and cool white, let you match the mood to the occasion without needing separate warm-only and cool-only fixtures.

Solar panel quality affects real-world reliability more than most buyers realize, particularly in regions with inconsistent sunlight. Products that specifically advertise upgraded panels or improved cloudy-day performance, like this one, are worth prioritizing if you've had disappointing results with basic solar post caps in the past.

Waterproof rating should be weighed against your climate. An IP44 rating, as offered here, handles general outdoor weather conditions reasonably well, though buyers in regions with heavier or more sustained rainfall may want to compare against IP65-rated alternatives for stronger long-term moisture protection.

Finally, consider your overall exterior color scheme when choosing a post cap finish. A matte black design, like this set, tends to complement a wide range of styles from modern to farmhouse, generally offering more versatile visual integration than lighter or more decorative finishes.

Item Model Number: B0FG7PC81V

Pack Size: 16 caps

Product Dimensions: 4.2 x 4.2 x 1.6 inches per unit

Weight: 4.87 pounds (full set)

Fit: 4x4 and 3.5x3.5 inch wood or vinyl posts

Light Color: Warm white

Material: High-quality ABS

Waterproof Rating: IP65

Power Source: 100 percent solar powered

Installation: Cap-style, fits directly over post top

Recommended Use: Garden, fence, pathway, yard, sidewalk, mailbox, patio, porch

The kolpop Solar Post Cap Lights are a 16-pack of compact solar-powered cap lights designed to fit 4x4 and 3.5x3.5 inch wood or vinyl posts. They're aimed at buyers with larger properties or longer fence lines who need to light up many posts at once without piecing together multiple smaller packs from different brands.

The core appeal is straightforward: a soft warm white light designed to create a pleasant, cozy atmosphere rather than a harsh, overly bright glow. Kolpop positions these as widely applicable across gardens, fences, pathways, yards, sidewalks, mailboxes, and porches, essentially any sun-exposed post around a property. The sizing is a key detail worth double-checking before ordering, since at 4.2 x 4.2 x 1.6 inches, this is a smaller fixture built specifically for 4x4 and 3.5x3.5 inch posts rather than larger 5x5 or 6x6 sizes.

Build quality centers on high-quality ABS material with an IP65 waterproof rating, giving the caps solid protection against a range of harsh weather conditions, whether sunny or rainy. As a newer listing, first available in August 2025, it doesn't yet carry the extensive review history of some longer-established competitors, but the fundamentals, simple design, proper waterproofing, and correct post-size targeting, align with what buyers typically look for in this category.

The main things to weigh are the compact fixture size, which may look smaller than expected on wider posts, and the single warm white lighting option, which offers less versatility than competing products with adjustable warm and cool white modes. As with any solar fixture, actual brightness and nightly runtime will depend on how much direct sun each post receives throughout the day.

Overall, this is a practical choice for anyone who needs to light up a large number of 4x4 or 3.5x3.5 posts in one purchase. The generous 16-pack count and confirmed IP65 waterproofing make it a reasonable, budget-conscious option for covering an entire fence line or garden layout.

Before ordering, measure your posts carefully to confirm they are 4x4 or 3.5x3.5 inches, since this is a smaller fixture designed specifically for those sizes and will not fit larger 5x5 or 6x6 posts.

Once the caps arrive, place them in direct sunlight for a full charge cycle before your first nighttime use to ensure consistent warm white illumination from the start.

Since this pack includes 16 caps, plan your layout in advance to cover a full fence line, deck perimeter, or scattered posts around a mailbox or garden bed, making the most of the larger quantity in a single order.

Pack Size: 2 caps

Fit: 4 inch wood or vinyl posts

Lighting Colors: Cool white, warm white, neutral white

Brightness Levels: 50 percent and 100 percent

Operation: Fully automatic, charges by day, illuminates at night

Power Source: 100 percent solar powered

Installation: Cap-style, fits directly over post top

Brand: Peasur

Recommended Use: Fence, deck posts, gates, mailboxes

The Peasur Solar Post Cap Lights are a 2-pack of solar-powered cap lights designed specifically for 4x4 wood or vinyl fence and deck posts. They're aimed at buyers who want meaningful lighting customization in a smaller, lower-commitment package, ideal for testing on a gate, mailbox post, or small section of fence before scaling up.

The standout feature is the combination of 3 color temperatures, cool white, warm white, and neutral white, paired with 2 brightness levels at 50 or 100 percent. That gives buyers real flexibility: warm white for a more comfortable, relaxed glow, cool white for a clearer, brighter look, and the ability to dial brightness down for energy savings or up for maximum visibility. Operation is fully automatic, with the lights charging during the day and switching on at night without any manual input, keeping daily use effortless.

Peasur specifically engineers this cap to fit 4-inch wood or vinyl posts, aiming for a precise, secure fit rather than a loosely sized universal design. Market data shows this listing performing strongly, ranking among the top sellers in the crowded 4x4 solar post cap lights category with an estimated 3,000 monthly unit sales, a solid signal of consistent demand and buyer satisfaction.

The main tradeoff is pack size. At just 2 units, this listing is better suited to smaller applications, like flanking a gate or lighting a single garden feature, rather than covering an entire fence line, where buyers would need to purchase multiple 2-packs. As with any solar fixture, actual brightness and runtime will vary based on how much direct sun each post receives, and this cap is sized specifically for 4-inch posts rather than larger 5x5 or 6x6 dimensions.

Overall, this is a well-performing, highly adjustable choice for buyers who want fine control over both color and brightness without committing to a large multi-pack right away. The strong sales ranking and dual customization options make it a smart starting point for anyone testing solar post cap lighting on a smaller scale.

Confirm your posts measure a true 4 inches before ordering, since this cap is precisely sized for that dimension and won't fit larger 5x5 or 6x6 posts.

Experiment with the 3 color temperatures and 2 brightness levels after installation to find your preferred combination, warm white at 50 percent brightness works well for subtle ambiance, while cool white at 100 percent suits areas where more visibility is useful.

If you're happy with the fit and look on your first 2 posts, consider ordering additional 2-packs to extend consistent lighting across a full fence line or deck perimeter.

Pack Size: 8 caps

Fit: 4x4 wood or vinyl posts

Lighting Modes: Cool white, warm light, neutral light

Operation: Automatic dusk-to-dawn

Waterproof Rating: IP65

Installation: Cap-style with included screws for secure mounting on both sides

Power Source: 100 percent solar powered

Brand: Flaow

Recommended Use: Fence, deck, patio, garden decor

The Flaow Solar Post Cap Lights are an 8-pack of solar-powered cap lights purpose-built for 4x4 wood or vinyl posts. They target buyers who want post cap lighting that goes beyond the typical single-mode design, offering more flexibility in color temperature while keeping installation simple and wire-free.

The standout feature is the 3 lighting modes, cool white, warm light, and neutral light, which Flaow notes stands apart from most solar post lights on the market that typically offer just one or two settings. Paired with what the brand describes as a unique appearance design, this mode variety is meant to help the caps coordinate more naturally with different outdoor aesthetics, whether that's a modern deck, a traditional garden fence, or a patio setting. Operation is fully automatic, with dusk-to-dawn sensing handling the on and off switching without any manual input.

Build quality centers on an IP65 waterproof rating, giving the caps solid protection against rain and general outdoor exposure. One detail worth understanding upfront is the fit: the cap is deliberately designed slightly larger than a 4x4 post to allow for a secure, non-forced installation. Flaow is explicit that this is intentional rather than a sizing defect, and the included screws on both sides are meant to firmly anchor the cap in place once positioned correctly.

The main things to keep in mind are that this fit design might initially seem unusual to buyers expecting a snug, flush cap, though it functions correctly once screwed in place as intended. These caps are also sized specifically for 4x4 posts, so anyone with 5x5 or 6x6 posts will need a different product. As with all solar lighting, actual brightness and nightly runtime will vary with how much direct sun each post receives.

Overall, this is a solid pick for buyers who want more lighting mode variety and a distinctive look on their 4x4 fence, deck, or garden posts. The multiple color temperature options and secure screw-mounted installation make it a thoughtful upgrade over more basic single-mode solar post caps.

Don't be alarmed if the cap appears slightly larger than your 4x4 post when you first place it. This is an intentional design choice for a secure fit, not a sizing error, use the included screws on both sides to firmly attach it in place.

Try each of the 3 lighting modes, cool white, warm light, and neutral light, after installation to decide which best matches your outdoor decor before settling on a permanent setting.

Mount the caps in a spot with consistent daily sunlight to ensure reliable dusk-to-dawn operation, since brightness and runtime depend on how much charge the solar panel collects each day.

Brand: SIEDiNLAR

Model number: SD020W-4PK

Pack size: 4 lights

LED count: 8 LEDs per light

Light color: 2 modes, warm white (3000K) and cool white (6000K)

Design: Seagull-shape with diamond lampshade

Post compatibility: 4x4 and 5x5 vinyl/plastic posts; 4x4 (3.5"x3.5"), 5x5 (4.5"x4.5"), and 6x6 (5.5"x5.5") wooden posts

Power source: Solar powered

Recommended use: Posts, fences, railings, mailboxes, pillars, and docks

The SIEDiNLAR Solar Post Cap Lights Outdoor 4 Pack is a decorative fence and deck lighting solution recognized as a leading product in the 6x6 post cap solar light category, distinguished by both its exceptional review history and a genuinely unique design approach. It's built for buyers who want their post cap lights to double as a distinctive visual feature rather than a purely functional fixture.

The standout feature is the seagull-shaped design paired with a diamond-cut lampshade, which projects a beautiful, patterned light display onto the posts at night, creating what the brand describes as a striking landscape effect. This distinctive shape sets it apart visually from the more common flat or dome-style post cap lights found throughout the category, giving it genuine decorative character beyond simple illumination. Combined with 8 LEDs and two switchable color modes, warm white at 3000K or cool white at 6000K, users can adjust the ambiance to suit their preference or the specific outdoor setting.

Post compatibility is a major strength, fitting both 4x4 and 5x5 vinyl or plastic posts, as well as 4x4, 5x5, and 6x6 wooden posts, a notably broad range that reduces the common risk of purchasing post cap lights that don't fit an existing installation. Beyond fences and decks, SIEDiNLAR positions the product for use across a wide range of applications, including railings, mailboxes, pillars, and docks, reflecting genuine versatility.

This product's track record is a significant point in its favor, with over 5,400 customer ratings maintaining a strong 4.6-star average, a scale of sustained positive feedback that offers considerable confidence in real-world reliability and satisfaction. It has also consistently ranked among the top sellers in related search categories, including 6x6 post cap solar lights specifically, reflecting broad, proven demand.

The main considerations are that the 4-pack size offers moderate coverage, meaning buyers with longer fence lines or larger multi-post decks will likely need additional packs, and the 8 LED count delivers a more modest brightness level, appropriate for decorative accent lighting rather than functional path or security illumination. As with all solar lighting, actual nightly performance will depend on each cap's panel receiving adequate daily direct sunlight.

Overall, this is an outstanding choice for buyers who want genuinely distinctive, decoratively shaped post cap lighting with proven broad post-size compatibility, backed by one of the strongest review histories in its category.

When comparing solar post cap lights, design and shape are worth considering alongside pure function, especially if you want your fence or deck posts to serve as a decorative feature. A distinctive shape like this SIEDiNLAR light's seagull silhouette and diamond lampshade creates a visually memorable effect that standard flat-cap designs don't offer.

Post compatibility remains the most critical practical spec to verify before purchasing. This product's exceptionally broad fit, covering 4x4 and 5x5 vinyl posts plus 4x4, 5x5, and 6x6 wooden posts, significantly reduces the risk of a sizing mismatch compared to more narrowly compatible competitors.

Review depth and consistency are especially valuable signals for post cap lights, since these products are typically purchased and installed in multiples. A large, sustained rating base like this product's over 5,400 ratings at 4.6 stars offers strong confidence that the majority of individual caps in a multi-pack will perform reliably.

Color mode flexibility, such as this set's switchable warm and cool white option, lets a single product adapt to different moods or seasonal preferences without needing to purchase separate single-tone alternatives.

Finally, match pack size to your total post count for both budget and aesthetic consistency. A 4-light pack works well for a shorter fence section, a set of mailbox posts, or select accent points, while longer fence lines or full deck perimeters will typically need multiple packs to maintain even, continuous decorative lighting throughout.

Pack Size: 12 caps

Fit: 4x4 wood or vinyl posts

Height: 2 inches (5 cm)

Light Color: Warm white

Shell Color: Black

Sustainability: Contains at least 50 percent recycled material, Recycled Claim Standard Blended certified

Included Hardware: 24 screws and plastic sleeves

Power Source: 100 percent solar powered

Installation: Cap-style, secured with included screws

Brand: VOLISUN

Recommended Use: Fence, garden, patio, porch, deck

The VOLISUN Solar Post Cap Lights are a 12-pack of black solar-powered cap lights purpose-built for 4x4 wood or vinyl posts. They're aimed at buyers who need to light up a significant stretch of fence, deck, or garden perimeter in a single order from a well-established, specialized lighting brand.

The core appeal here is proven reliability at scale. This listing has built up a substantial review base, holding a 4.5 out of 5 rating across roughly 1,500 customer reviews, a strong signal of consistent satisfaction for a product in this category. VOLISUN also stands out for its sustainability credentials, with the product certified under the Recycled Claim Standard Blended for containing at least 50 percent recycled material, a detail that may appeal to environmentally conscious buyers.

Functionally, the caps deliver a warm white glow suited to garden, patio, and porch settings, and the package includes 24 screws and plastic sleeves for a secure installation. VOLISUN is explicit about checking post dimensions carefully before installing, noting that solar post cap lights are inherently small fixtures, this particular 4x4 version stands just 2 inches tall, so buyers should confirm their post size matches before ordering. The brand also offers direct support for sizing questions, stating that its service team is available to provide professional guidance if any dimension issues come up during installation.

The main things to note are that this specific listing is sized for 4x4 posts only, VOLISUN sells separate packs for 5x5 and 6x6 posts, and that it offers a single warm white lighting option rather than the dual warm and cool white modes found on some other VOLISUN listings. Buyers wanting adjustable color temperature may want to compare against those alternate versions.

Overall, this is a dependable, well-proven choice for anyone with 4x4 fence or deck posts who wants a larger quantity of solar cap lighting from a brand with a strong track record and responsive customer support. The combination of a high review count, strong rating, and recycled material content make it a solid pick among 4x4 solar post cap lights.

Before ordering, measure your posts to confirm a true 4x4 fit, since this cap stands just 2 inches tall and is a genuinely small fixture. VOLISUN's support team is available if you have any doubts about sizing.

Use the included screws and plastic sleeves to firmly secure each cap once it's positioned correctly on the post, this helps keep the fixture stable through wind and weather over time.

If you need lighting for 5x5 or 6x6 posts, or want a dual warm and cool white option instead of a single warm white setting, look at VOLISUN's other post cap light listings, which are sized and configured differently from this specific 4x4 pack.

These PASAMIC solar post lights arrive as a two-pack of 63-inch poles fitted with warm white LEDs. They target homeowners who want solar-powered outdoor lighting for gardens, pathways, and patios without running wires or paying for electricity.

Four solar panels charge the units in six to eight hours of direct sun, after which the lights activate automatically at dusk and run for ten to twelve hours. Real-world use shows consistent overnight performance when panels stay clean and exposed, though output stays moderate rather than intense.

Construction uses powder-coated metal poles and reinforced glass shades in a retro style. Height adjusts by removing the connecting pole, and installation works via included stakes for lawn or screws for hard surfaces, though proper anchoring helps stability.

Drawbacks include the need for full sunlight exposure and thinner pole material that can feel top-heavy. Brightness suits ambient accent lighting more than task illumination.

Overall these lights deliver solid value for easy solar pathway accents when expectations match their moderate output and weather-resistant build.

Brand: Brightown

Pack size: 4 lights

LED count: 16 LEDs per light

Brightness: 20 lumens

Light color: 2 modes, warm white and cool white, switchable via base flip switch

Post compatibility: 4x4 wooden posts (mount is 0.5 inches smaller than listed size), 4x4 vinyl posts

Charge time: 6-8 hours of direct sunlight

Waterproof rating: Waterproof, all-weather construction

Power source: Solar powered

Recommended use: Garden, patio, fence, deck, yard, and mailbox

The Brightown Solar Post Cap Lights Outdoor 4-Pack is a compact, entry-level fence and deck lighting solution designed for buyers who want to add both style and functional dusk-to-dawn illumination to their 4x4 wooden or vinyl posts without a large upfront commitment.

The standout feature is the dual color mode design, giving users the choice between warm white light for a relaxed, cozy atmosphere or cool white light for crisper, more security-oriented brightness, switchable via a simple flip switch at the base of each unit. With 16 LEDs packed into a compact strip producing 20 lumens, these lights are well suited for evening gatherings, garden decoration, and general outdoor accent lighting rather than high-intensity functional illumination.

Charging performance follows a straightforward solar cycle, with the high-efficiency panels charging for 6-8 hours during daylight and automatically illuminating each night without any manual switching. Brightown emphasizes the product's all-weather construction, built from premium materials designed to withstand high heat, pouring rain, and snowstorms, and notably positions the caps as helping protect the fence post itself from rain and sun exposure, potentially reducing the risk of premature wood rot over time.

The product is marketed for a genuinely wide range of installation scenarios, extending beyond typical fence and deck use to include patios, sidewalks, walkways, yards, and even mailbox posts, reflecting its versatility as a general-purpose accent lighting solution. As a fully solar-powered product, it also delivers ongoing savings on both labor and electricity costs compared to wired lighting alternatives.

The main considerations are that this set is specifically sized for 4x4 wooden or vinyl posts only, and is not compatible with 5x5 or 6x6 post sizes, so buyers should confirm their post dimensions before purchasing. The 20-lumen brightness output is best suited to decorative ambiance rather than functional security lighting, and the smaller 4-pack size will likely need to be supplemented with additional packs for buyers looking to cover a longer fence line or larger deck perimeter.

Overall, this is a sensible, lower-commitment choice for buyers wanting to test solar post cap lighting on a smaller area or specific accent points around their property, offering genuine warm-to-cool flexibility and weather-protective construction in a compact starter pack.

Pack size should be matched to your specific project scope when starting with solar post cap lights. A smaller 4-pack, like this Brightown set, works well for testing the product on a smaller section of fence or a handful of specific posts before committing to a larger multi-pack purchase for full property coverage.

Post size compatibility remains critical to verify before buying. This set is designed specifically for 4x4 wooden or vinyl posts, and will not fit 5x5 or 6x6 posts, so always measure your actual posts against the listed compatible sizes to avoid a fitment issue.

Color mode flexibility, such as this product's switchable warm and cool white option, is a valuable feature that lets a single set of lights adapt to different moods or purposes without needing separate warm-only and cool-only products.

Consider whether protecting the post itself matters to you beyond just illumination. Some post cap lights, including this one, are specifically designed to shield the top of a wooden post from direct rain and sun exposure, which can help slow premature rotting over time, an added benefit worth factoring in in wetter climates.

Finally, brightness expectations should be set around the intended use. At 20 lumens, this set is well suited to decorative accent lighting for gardens, patios, and mailbox posts, rather than functioning as a primary source of security or safety illumination.