what type of bulb in a desk lamp - The Planted Tank Forum

 
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post #1 of 9 (permalink) Old 11-22-2007, 06:18 PM Thread Starter
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what type of bulb in a desk lamp

Hey guys,

I am looking at getting a desk lamp from walmart for lighting in my planted 5 gallon tank. I was wondering what type of bulb to get specifically, and what wattage to look for in a desk lamp to grow low light plants in a 5 gallon tank.
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post #2 of 9 (permalink) Old 11-22-2007, 08:55 PM
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If you get one of the screw-in compact fluorescent bulbs, I would suggest something in the 20 watt range. They will say something like 75 watt, but that is just an equivalence to incandescent bulbs.

Also, I would choose the "daylight" flavor, which emit a nice white light. The color temperature of them is somewhere between 5000 and 6700 Kelvin.
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post #3 of 9 (permalink) Old 11-22-2007, 11:10 PM Thread Starter
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So the bulb itself says 75 watts on the box? How do I know which lamp unit to get? Do I look for one that already has a 20 watt bulb in it that I can replace, or what? For example, will that "75 watt" cf bulb work in a desk lamp that came with a 13 watt lamp inside?
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post #4 of 9 (permalink) Old 11-22-2007, 11:32 PM
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Make sure it is a lamp that will fit normal screw in light bulbs. They usually say 60 watt max on them, but that is for incandescent bulbs.

The bulbs says something like 75 watt equivalent using 20 watts of electricity. Last time I was at Walmart they had a large display of screw in CF bulbs.
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post #5 of 9 (permalink) Old 11-22-2007, 11:45 PM Thread Starter
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So if it says 60 watt max, can I still use the 75 watt equivalent CF bulb?
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post #6 of 9 (permalink) Old 11-22-2007, 11:54 PM
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Quote:
Originally Posted by likwid View Post
So if it says 60 watt max, can I still use the 75 watt equivalent CF bulb?
exactly, the fixture would only be using 20 watts of electricity
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post #7 of 9 (permalink) Old 11-23-2007, 02:23 AM Thread Starter
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I just bought a cool white 23 watt bulb that does 100 watts. Is this overkill for a 5 gallon tank?
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post #8 of 9 (permalink) Old 11-23-2007, 02:50 AM
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Should be fine for a medium to semi-high light tank.

Rena Filtstar #137!
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post #9 of 9 (permalink) Old 11-23-2007, 03:57 PM
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Wattage should be fine. If I remember correctly, cool white is something like 4100K. Not unusable, but personally I prefer a "whiter" light, 5000K and above.
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