Well, in the past few month i have been interested in a different part of Sunlight.photography...wawelenght 260 -300 nm...forensic photos,
and had to prepare my equipment for this, as follows...
Step 1: Source
The source of UV light can be normal bulb but with Woods-glass, fluorescent bulb with the same glass, and UV led-s. The first two use high Voltage, which was inconvenienced for my needs, so I purchased on E-bay UV led-s 260-400nm.
More on UV, phosphorescence and photography you can find on Web.
This UV led's has to be mounted in a waterproof housing ...
Step 2: Preparation
I have to construct housing - it has to be plexiglas, tube with O-ring covers. LED has to be in a circle to get strong, even emission UV light.
First drawings, and planning, and..voila.
I took plexi plate 4mm thick and cut of circle,diameter to fit tube. drill holes for UV led's 8mm and 5mm, according plan, to get holder for led's...
Step 3: Led's Holder
Two different types of led's ... 8mm 390-410 nm and 5mm 370nm, parallel wired connection, so each got 3,6V and 20 mA, according producers tech.spec. I choose NiMh 2000mA rechargeable batteries as power source - direct connection, 3 pc's x 1.2V = 3.6V.
Step 4: Housing
I choose two different diameter plexi tubes, one which fit to hold 3 battery holder flat, and bigger one to hold led's.
Tube cover with O-ring seal for bigger one and smaller are glued together facing opposite each other. Smaller has no O-ring seal and smaller tube I glued direct to them. I cut simple glass mirror as a bottom under led's holder.
Step 5: Assembling
Well, further was little easier. From pictures you can got idea about all this project. Switch is added on the back cover, small 4mm shaft, O ring seal, micro switch an rotating plexi ex-centar. Mirror glass reflect all back emitted light forward,
Step 6: First Results
Of course, I took several pictures to see what I shall get. Before diving...I at last few pictures under water..This UV underwater photography shall be very interested field for future research...
Limitation is weak light, has to be photograph in a dark with long exposures, night pictures, avoiding any "daylight" intrusion and finding objects, flora and fauna, with Phosphorus, etc...etc.
So, I made this for me.
No any responsibility for yours.
Kreaimir Pregernik, dipl.ing