New to Fluorescent lighting. - Tropical Fish Keeping - Aquarium fish care and resources

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post #1 of 17 Old 11-04-2012, 10:23 AM Thread Starter
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New to Fluorescent lighting.

Well yesterday I was bord and had some extra cash so I went out and bought a used 30 gallon tank and used Fluorescent light fixture oh and suitable filter. It replaced one of my 10 gallon tanks I have, all I did was transfer everything into the new tank. Only problem is the bulb is not bright enough, it says 20 watts. Oh it's a single 23'' T8 I believe, and it has no K reading on it? And this is a fully planted tank with amazon swords, pennyworth, and water sprites. so what would be a suitable bulb?
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post #2 of 17 Old 11-04-2012, 10:28 AM
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It would have to be either an 18" or 24" tube, measure the length of the tube and not the fixture (it includes the prongs I think). If 18" you can buy regular Daylight tubes at a hardware store that are 6500K. If it is 24" you'll probably not find them and be forced to buy the ones at the Pet Store (or go online). I think a name of one is Ultra Sun if I remember right.
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post #3 of 17 Old 11-04-2012, 10:32 AM Thread Starter
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It would have to be either an 18" or 24" tube, measure the length of the tube and not the fixture (it includes the prongs I think). If 18" you can buy regular Daylight tubes at a hardware store that are 6500K. If it is 24" you'll probably not find them and be forced to buy the ones at the Pet Store (or go online). I think a name of one is Ultra Sun if I remember right.
Ya it's 24", I wasn't measuring with the prongs.
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post #4 of 17 Old 11-04-2012, 10:37 AM
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Measure the diameter just to make sure. T8 means it is 8/8 of an inch, or 1 inch.

Older fixtures might be T12 which is 12/8 = 1.5 inch diameter. T12 are higher wattage than T8 because they are less efficient.
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post #5 of 17 Old 11-04-2012, 10:42 AM Thread Starter
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It's 1 1/2", so that's a T12. Not what I wanted, can I put a T5 into this fixture? Or can I get a T12 bulb that will work? Also If I have to I can return the fixture and get a proper one.
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post #6 of 17 Old 11-04-2012, 10:45 AM Thread Starter
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It's 1 1/2", so that's a T12. Not what I wanted, can I put a T5 into this fixture? Or can I get a T12 bulb that will work? Also If I have to I can return the fixture and get a proper one.
I meant T8 not T5.
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post #7 of 17 Old 11-04-2012, 11:13 AM
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a T8 bulb will fit the fixture, but may not operate properly, the wattage is different (24" T8s are 17 watts, so the T8 will be over driven) as well as the frequency at which the ballast operates

I would just get a new T12 bulb, they are still available
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post #8 of 17 Old 11-04-2012, 01:51 PM
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T12s aren't very bright, I have a single T12 over a 20 long and I don't think its bright enough. Might be enough for swords though.

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post #9 of 17 Old 11-04-2012, 02:19 PM Thread Starter
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I ended up going back to the store and returned the light, and went with a dual T5 light system.Looks great.
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post #10 of 17 Old 11-04-2012, 05:25 PM
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You've changed the fixture, but I will still mention on the single T12/T8 (for the benefit of whomever) that this will be insufficient without specific tubes. I have a 24-inch T8 over my 29g, and I have to use Life-Glo tubes in order to keep the plants alive. The "Daylight" tubes just don't do it. ZooMed's UltraSun would also be OK, it is similar to the Life-Glo.

Chris, on your dual T5, does this have NO or HO tubes? If NO, that is roughly equivalent to T8 so at the high end of moderate light. If HO, that is very bright and you will have to keep the duration down and cover the tank surface with floating plants to avoid a tank of algae.

Byron.

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Vancouver, BC, Canada

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian. [unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]
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