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#1
09-27-2008, 12:56 AM
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Don't think there's a lot of useful UV from halogens. You can't even use them to grow plants.
For HQI all you want is regular old glass. Probably tempered but it's otherwise it's just ordinary glass aka "clear float".
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-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee! 
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#2
09-27-2008, 06:03 AM
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Not worth the risk to me... I like to watch the tank and my mother had cataract surgery, so don't to experience that... so a "couple of bucks" to spend on UV coated glass isn't too bad. It's probably very low risk as noted, HQIs don't generate a lot of UV, but eye damage is cummulative...
http://www.newton.dep.anl.gov/askasc.../chem00539.htm
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