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Re:hotsie totsie
Date: Thu, 6 Sep 2001 01:21:45 -0700
From: "Robert H" <robertpaulh at earthlink_net>
Subject: Re:hotsie totsie
<snip>
>>I just moved the All Glass PCF on new tank I set up yesterday to discover
the glass tank cover under the 2-55 w fixture to be cracked, which I believe
was caused by the heat.<<
I would be really shocked if that were true. Glass can take a lot of heat
before cracking, unless the glass is defected. I dont see how a PC could
ever get that hot. I know people who run combinations of high wattage metal
halides and PCs in a closed hood inches away from glass. It dont compute!
Robert Paul H
http://www.aquabotanic.com
The 1/4 inch glass under my 2, 2 x 55 watt (3 foot fixtures) cracked too. I
did use glass that had been sitting around in someone's garage for several
years and chalked it up to funky glass. The All Glass lights ARE much
hotter than the AH lighting systems though. I didn't take them apart to see
if they have the same sort of ballast but I know their reflector doesn't
hold a candle to the AH stuff. I have 4 x 55 inside (4 foot hood, by AH )
sitting right next to the All glass lights. They are warm but they just
don't produce the same amount of heat. I'm much more careful with the glass
now and make sure that the 2 lights are several inches apart to avoid a
repeat. On the AH "box" I put a 1/4 inch "bumpers" on the back 2 corners so
it tilts up slightly in the back. I think if you could raise these just a
bit off of your glass it would help with the cooling. Hope you used the
vents that come with the retro-fit kit too when you plop them into those
plastic hoods. They don't have enough venting in them.
Gary Lange
gwlange at mindspring_com