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Old 01-03-2006, 05:26 PM   #1
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lightbulb

well at the lfs today i bought the power glo light bulb its for my 20 gal tank and it is 15 watt 18 inch(no higher wattage) it also has 18,000 k, would this be a good bulb for my tank? it was from 18000 to 2800 k and so i got the 18000 what does k really mean and what is good?

it also says good for african chiclid tank, high blue spectrum and lux of 55
is 18000 to much becuase i read in the sticky that plants use between 5000 and 10000k
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Old 01-03-2006, 06:30 PM   #2
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K is Kelvin, it's the temperature of the bulb (colour output).

the spectrum is the important part, I was growing some great anubias with powerglo's, but it's heavy in the blue so the plants tend to stay lower to the ground, at least IMO.
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Old 01-03-2006, 06:32 PM   #3
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ya but it only has alot of blues the other light at the lfs has alot of red/orange also and has the same k rating
if you had to pick from all these
http://www.hagen.com/usa/aquatic/sub...&PSUBCAT=11204
what would u pick for somewhat planted tank with 2 african chiclids
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Old 01-03-2006, 06:34 PM   #4
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and now you see why K rating is kinda useless in determining what makes a good plant bulb.

good peaks in the blue and red spectrum, make a good bulb.
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Old 01-03-2006, 06:49 PM   #5
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good think i didnt use the bulb yet so now ill take it back and find 1 with higher red and blues and does it matter if it still has a high k rating? bc the 1 with high blue and red is
http://www.hagen.com/usa/aquatic/pro...01015820021001
and it has 18000k but the best red and blue
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Old 01-03-2006, 06:52 PM   #6
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Quote:
Originally Posted by malkore
and now you see why K rating is kinda useless in determining what makes a good plant bulb.

good peaks in the blue and red spectrum, make a good bulb.
But, kelvin lets you know how it will look (I like 6500k for good, white light).
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Old 01-03-2006, 08:06 PM   #7
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ya ill try and exchange for a moderate k and high blues and reds but if i cant get a moderate k ill get a high k or a low k, is a low k or high k bad? what do they look like?
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Old 01-04-2006, 12:16 AM   #8
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K is really just a rating of how the light looks to your eye. High K is a stark white to a blueish tinge - like winter morning on a clear day. Mid range (8k) is blended light, like summer sun. The lower K rating will give you a warmer, even yellowish/reddish light. Like late afternoon sun.
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Old 01-04-2006, 12:42 AM   #9
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ya bc i got 1 now with 2700k and it looks to dark so ima go back and exchange again and get 1 with 6700 k even tho the box says for terrariums but in a book it said enhances plant photosynthesis
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Old 01-04-2006, 12:43 AM   #10
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I find 6500K tends to be yellow and by itself washes out good greens in plants. 10000K gives me the best white. 8000-9325k is a nice pinkish that mixes well with 6400-6700K bulbs IME. 12000K bulbs are very blue looking.
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