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07/13/2007, 05:04 PM
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#1 |
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Registered Member
Join Date: Aug 2006
Location: white oak
Posts: 1,974
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how long for mh bulbs to cool down
i got new bulbs and the ones that came with mine i have no idea how old they are and i would like to change them
is around 20 mins or ok to let cool or should i wait longer i can't do it before they come on cause i am at work |
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07/13/2007, 05:13 PM
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#2 |
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100-mile-commuter
Join Date: Dec 2004
Location: almost nevada
Posts: 4,721
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20 minutes should be ok. Just be careful and use a towel (not your hands), especially when installing new bulbs, and especially if they are the small double ended variety.
__________________
Custom electronics purveyor. blueAcro.com Current Tank Info: 90g SPS+mixed reef (10 yrs): LEDBrick LEDs, 40g custom sump, Ca reactor, chiller, Vortech, lots of custom electronics |
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07/13/2007, 05:49 PM
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#3 |
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Registered Member
Join Date: Aug 2006
Location: white oak
Posts: 1,974
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thats what i thought but wanted to make sure
thanks theatrus |
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07/13/2007, 06:05 PM
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#4 |
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Registered Member
Join Date: Aug 2006
Location: white oak
Posts: 1,974
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why do i have to use a rag when i touch the bulb even when its not hot some bulbs they say to only touch the ends
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07/13/2007, 07:39 PM
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#5 |
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Registered Member
Join Date: Mar 2007
Location: VA
Posts: 549
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The oil from your fingers will rub off on the bulb. This will cause that area of the bulb to heat up more and if there is enough heat it will crack.
__________________
The Reptile File Forum (Google It) Discussion forum dedicated to geckos, lizards, snakes, turtles, amphibians, and other reptiles. Current Tank Info: 90gal reef w/ 20 gal sump, Aquactinics TX5, Octopus NW150, AquaController Jr. |
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07/13/2007, 09:26 PM
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#6 |
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100-mile-commuter
Join Date: Dec 2004
Location: almost nevada
Posts: 4,721
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This is especially true for the double ended small variety, but oil on your hands ends up on the quartz tube, causing uneven heating, and potentially causing it to weaken and then shatter. By using a clean towel or being very careful you avoid those issues.
__________________
Custom electronics purveyor. blueAcro.com Current Tank Info: 90g SPS+mixed reef (10 yrs): LEDBrick LEDs, 40g custom sump, Ca reactor, chiller, Vortech, lots of custom electronics |
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07/13/2007, 09:55 PM
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#7 |
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Texas Reefer
 
Join Date: May 2003
Location: Round Rock, TX
Posts: 13,656
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My old 175w's where cool to the touch in about 10 minutes (Single ended). I never worried about touching the single ended bulbs, I just made sure I cleaned them off with vinegar after installation.
__________________
Rich Overton 150G cube FOWLR, 30g sump, ReefKeeperII, 3x Koralia 1400's, QuiteOne 3000, Reef Octopus DNWB150, 4x 30w Par38 LED. Current Tank Info: 36x36x27 150g |
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07/16/2007, 05:07 AM
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#8 | |
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Moved On
Join Date: Feb 2007
Location: Miami Florida.
Posts: 3,842
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