I have an aquarium light fixture I'm not using and was wondering if I could use it to expose screens? It's a 24" T5 H/O 6x24w light with individual parabolic reflectors (ATI Powermodule). It already has UV and actinic bulbs for growing coral. I could easily hang the fixture above my screen and adjust the hanging height. Do you foresee any problems? Many thanks!
Yes you can use it. That's not a lot of light so it may have to be fairly close to the screen. But it will work once you figure out where your sweet spot is. My guess is that light fixture could be about 14" away from the screen at most. The closer the better.
We use super actinic aquarium bulbs in our econo line of exposing units. Distance should be approx 6" from glass. this is an array (6 lights?) a single UV bulb won't expose except in a line above the bulb.
PS, if you find on washout that you have thick and thin stencil areas following the bulbs(banding), you are too close. If you get too far away, the low output won't burn the screen very well. there is always a sweet spot.
Thanks for your replies! Yes, the fixture is an array of 6 T5 lights. The individual parabolic reflectors make this light more powerful than normal T5 fixtures. The fixture dimensions are 23.0" x 13.5". That said, what size screen sizes do you think I could expose using the aquarium light? I am interested in printing larger posters using either 23x31 or 25x36 screens. With these screen sizes would I need a larger light source that is closer to the screen size? Many thanks!