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Choose the LMT Mercer Neptune Downward Solar Post Cap Light to effortlessly add ambient downlighting to your posts. The cap features a tiered look with curved edges, plus solar-powered LED lights that shine down from all four sides. It fits 4 or 5 inch post sleeves. A charged battery is included, but it may take a couple days to fully charge after installation.

Unsure about your size? Measure your posts carefully and use our Post Cap Diagram to understand critical dimensions and ensure a proper fit.


DecksDirect # 6447

LMT Solar Light Installation Instructions

LMT Solar Warranty

FinishesAlmond, Black Hammertone, and White
Pack SizeEach
Post Cap Opening Size4-1/16 in and 5-1/16 in
Material Type

Vinyl body, acrylic lenses

BatteryLithium Ion - 600 mAh 3 volt battery
BulbIntegrated LED
Color TemperatureCool white (5000 Kelvin)
(width x depth x height)
4-1/16 in: 6 in x 6 in x 2-1/8 in
5-1/16 in: 7-1/4 in x 7-1/4 in x 2-1/4 in
Inset Measurement1/2 in
Package Contents(1) light with (1) 600 mAh 3 volt battery, installation instructions
Illumination Arean/a
WarrantyView LMT Warranty Information
OtherCoordinating un-lit post cap available
Initial charge time: 24-48 hours of exposure to sunlight needed.
Run time: Varies with exposure to sunlight.
Batteries are not covered under manufacturer warranty.

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