UV bulb replacement
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Old 12-21-2004, 11:15 PM   #1
JohnnyB
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UV bulb replacement


My UV sterilizer has been running almost a year without a bublb replacement.

How often do you guys replace your UV bulbs?

Thanks,

Johnny B
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Old 12-22-2004, 12:51 AM   #2
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when it burns out...
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Old 12-22-2004, 02:01 AM   #3
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I just had this discussion with a clerk in a LFS today.

She recommended changing out a UV bulb every 12 months in freshwater, every 9 months in salt. I asked why, and she said "because it's better"!



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Old 12-22-2004, 03:50 AM   #4
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I have a Aqua Ultraviolet and they recommended 14 months. Did anyone check out the Aquarix software, it keeps a schedule of everything on your tank and tells you when lights, filters, CO2, and more need to be changed. Just thought I'd bring it up.
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Old 12-22-2004, 08:58 AM   #5
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From what I understand the spectrum/intensity starts to shift (i.e., becomes less effective) sometime between 6-12 months after installation. It's closer to 6 if you run yours 24/7. Mine is off for 48 hours a week after I add bacteria to my tank (Microbe-Lift). I still replace it every 6 months.
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Old 12-22-2004, 04:54 PM   #6
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I thought Coralife recommended every 6 months...

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Old 12-22-2004, 07:16 PM   #7
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I've always read the regular fluorescents are changed at 6 months, Power Compacts with no fan at 9-12 months, with fan 12 -14 months, UV 12 -14 months. Maybe thats in gereral or unless the manufaturer specifies other wise. The company that makes Aqua Ultraviolet also makes large units for household use on well and septics systems that can't use chlorine for bacteria, and they suggest 12 -14 months.
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Old 12-22-2004, 07:17 PM   #8
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Don't forget you UV lighting is cooled constantly with circulating water.
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Old 12-22-2004, 07:38 PM   #9
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The bulb is never in contact with water.. the Glass tube surrounding the bulb is... so while the glass surrounding the tube is making contact with the water, the airspace surrounding the bulb gets quite hot before it can transfer heat to the glass sleeve.
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Old 12-22-2004, 07:48 PM   #10
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I'm not sure about that, I don't think they produce much heat anyway. Mine has a 57w transformer and it's only a 8w bulb, so it wouldn't take much to cool the air gap between the quartz sleeve and bulb. Also it has a wiper feature when you use the wiper it clean any debris off of the quartz sleeve, and thats made of rubber so it couldn't take a constant high temperature.
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Old 12-22-2004, 08:00 PM   #11
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Buy the way, get some visine or somethin' for that eye man. Your freeeakn me out!
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Old 12-22-2004, 08:56 PM   #12
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My 18 watt unit gets hot enough that I can't handle the bulb if its been on for a while... I can't speak on lower wattages though
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Old 12-22-2004, 09:33 PM   #13
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my 18 and 9 watt turbotwist are fine, and mine are on 24/7
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Old 12-22-2004, 09:40 PM   #14
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So are mine... I never said that heat is a problem.. just that its not really going to be "actively cooled" by the water flow.

But, back on topic... 6 months for my bulbs. I take no chances.
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