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26-watt Shortwave (AC) Display Lamp

DIY Instructions

Tools Required: Screwdriver, drill.

Construction time: Under 2 hours

This lamp has two 13 watt UVC bulbs and a huge filter area.  26 watts of UV thrown out over a wide area makes for a very nice display light.  AC powered, for use as a display lamp at home or rock shows.


Evergreen S626 26W PL13 Aluminum Flood Light  - $32 online (as of March 2015)



Same lamp modified using these instructions

There are probably a bunch of lights that would work for this project.  I chose the Evergreen S626 because it was the right size, had a solid extruded aluminum case, and I like the mounting.

Detailed parts list on the left.

The first thing I would do is temporarily wire it up to make sure it's working.


Works?  OK - Let's begin!

Remove the end cap shown and pull out the light bulbs (throw them away, responsibly). We'll install two 13w UVC bulb later.  Remove the glass lens and pull out the reflector.  You're going to replace the existing glass lens with a Hoya filter so you won't need that unless you're going to be cutting your own filter glass and want to use it as a template.


 Remove and discard the white light fluorescent bulb that came with the lamp; we'll be replacing it with a UVC bulb (be green - mercury lamp).  Pictured above are all of the individual components.  Set everything aside while we ready the clear plastic lens assy for mounting the Hoya filter.



I glued heavy duty aluminum foil on the existing reflector.  I tested the existing one and found that it does not reflect UVC well; I believe that it is coated with some kind of protective coating.  My meter showed a 25% improvement when I covered it with aluminum foil.  I just took a piece of heavy duty foil, slapped some black silicone glue on the reflector and laminated it with the foil.  After it dried I trimmed the edges with a razor blade.



Once the reflector was dry I reinstalled it in the box, but not in the original grooves meant for it.  As the above pic shows I just let it rest below those grooves.  The much thicker Hoya filter will slide in and be captured by the reflector and the aluminum housing as shown.




The next step is to glue the Hoya filter in place.  I use high-heat black silicon glue.  Just run some tape along the edges as shown (one side is already finished), run a strip of glue down the edge.  Wet your finger with soapy water and smooth out the blue bead, remove the tape and voila!



Note the foam filter at the left end: I left a 1/4" gap between at that end for airflow and I drilled two 5/16" holes in the cover on the other end (the one you removed).  This will allow air to flow over the blubs and the foam will block the light from escaping.  You could use steel wool also, or even a piece of metal with vents if you have the tools to make one.


Your lamp is finished.  I like the mounting: you can install it in an electrical box, with an on/off light switch.  Or - you can connect the mount directly to your display cabinet and swivel the lamp to point in almost any direction.  Very versatile....


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