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More on Dichroic Glass...

More on Dichroic Glass...

Below I posted about my top three favorite worship colors, and mentioned something called dichroic glass.

This is from Rosco, describing their Permacolor dichroic glass:

"Dichroic filters are durable glass color filters that transmit only certain wavelengths of light, reflecting the rest of the spectrum, rather than absorbing it.  Since virtually no energy is absorbed by the filter, light transmission is significantly higher than traditional gels and will never burn out or fade.  Rosco Permacolor filters are made with the highest quality coatings, designed not to fade or shift color.  In addition, Rosco's sophisticated manufacturing process allows for precise color consistency batch to batch to a degree that is unprecedented in other dichroic coatings.  Permacolor filters are manufactured in five standard sizes on durable borafloat glass 1.75mm (.069") thick or can be custom cut in any size up to 13.5" in diameter."

So, in short:  Gel ABSORBS all other wavelengths of light, which glass REFLECTS.  This means more light output and longer life of the color media.  To me, it's the best accessory to add to your conventional lighting fixtures to get the most bang for buck out of them.  Instead of using 4-8 1000 watt PAR64 with blue gel, you can use 2-4 575 watt ETC PARs with blue dichroic glass, and it would look close to the same, if not better!

Of my top three worship colors (red, blue, amber), I actually only use glass for the blue; the red and amber are intense enough that the glass didn't make THAT much of a difference.  Plus, you factor in that the warm color temperature of the lamp (HPL, in a Source4 leko) is warm to begin with, so the red and amber gel works fine.  Blue, however, as you know, is a cool color, so the warm color of the naked lamp just eats up the blue gel.

I like Rosco Permacolor R80 - it's primary blue, but what I've found is that as the light is left on, the deeper the color gets.  It starts off clean, primary blue, but eventually shifts to a deep saturated blue.

Intelligent lights/moving heads use dichroic glass inside the fixture to create color because of the intense, focused light coming through that housing would literally burn through any kind of gel within seconds.  It's a great way to get better color, intensity and life out of your conventional color fixtures!


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