Simple, single AAA alloy LED backup light, using low cost parts from internet hobby electronics suppliers. Kit includes all parts required to construct rugged, water resistant light.
If using epoxy resin to seal light, it would be sensible to fully assemble and test light before permanently bonding any parts.
Connect Cree LED and boost circuit with +ve and -ve wires as illustrated. Carefully orientate boost circuit and LED into the short aluminium tube (15mm long tube with male thread at each end).
If you don’t fancy the soldering element, then parts kit is available with the LED and driver circuitry prebuilt for very easy tool free assembly.
Fit glass window into front tube. This can fitted with a small amount of epoxy resin applied to the inside lip of the front tube to achieve a water resistant result. Reflector can then be dropped in to front tube.
Front reflector tube can now be screwed to LED and driver tube, taking care to orientate the LED and reflector. The two tubes can be fitted with a small amount of epoxy resin applied to the thread to achieve a water resistant result. However, note that this would make it difficult to take apart should a requirement arise.
Attach battery tube to LED and reflector aseembly. The battery tube can be fitted with a small amount of epoxy resin applied to the thread to achieve a water resistant result. However, again note that this would make it difficult to take apart should a requirement arise.
Fit O ring to 'twist on' tail switch. Note polarity of AAA battery. Battery -ve to tail switch, and +ve to boost circuit / LED. Boost circuit and LED tested prior to despatch. Note, reverse polarity will likely kill circuitry.
Tail switch can be screwed in to rear end of battery tube. Tail switch used to turn light on / off. As backup light our preference is to fully tighten tail switch to ensure good water integrity, using 8mm dia vinyl insulator supplied in kit to isolate battery. Insulator can be removed if ever a requirement to use this back up light.