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Unregistered
09-23-2006, 07:30 PM
does anyone know if the tempered glass included in air cooled reflectors can be improved upon for uv light transmission. its my understanding that an optical quality quartz glass will do the trick any suggestions?

NJGardener
01-16-2007, 07:18 AM
Well, yes, there are special glass products that can let more UV pass, but considerably more expensive that the standard tempered glass.
But -- What are you looking to accomplish with increased UV levels?
It's my understanding that UV has little of no benefit to plant growth and can cause plant damage (and certainly human damage) if too much is supplied. The purpose of the outer envelope on the bulbs is to block most of this UV.
(By the way, there is some interest in experimenting with "broken" bulb envelopes in helping to sterilize grow rooms between crops. HOWEVER, THIS IS VERY DANGEROUS FOR SEVERAL REASONS AND REQUIRES A DOOR INTERLOCK TO ENSURE THAT THE LIGHT CAN NEVER BE ON WITH THE DOOR OPEN OR ANYONE INSIDE. BROKEN BULBS CAN ALSO BE DANGEROUS TO HANDLE AND MAY PRESENT A FIRE HAZARD.)