Step 1: Woods glass

This glass is a  UV band pass filter.
You can usually find this on a bulbs for Disco/Party purpose. All teeth under this light are white  :)
Cheapest way to get this glass is a bulb. So, get the bulb, remove metal and wires....
Break a small tube and let air inside...  
<p>Interesting! Have you made any underwater uv films? I would really like to see how it looks like. I am busy with a similar project I just use 400w uv led :) busy sorting dichroic filters. What would you suggest I should use to see underwater minerals glow. UV A or UV B?</p>
<p>Another way to get a UV flash is to remove the UV filter from an old flash gun.</p><p>The UV filter is usually a &quot;Gold&quot; plastic filter over the flash tube. </p><p> Another alternative is many of the disposable cameras don't have any UV filters at all. This is of some concern as anyone using one of the cameras is exposing their subject to UV.</p>
That's actually pretty good. The incandescent UV bulbs are absolute crap for UV lighting. Glad they could actually be put to some good use.

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