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Hey guys. I am looking for a better bulb for an aquarium I have. It is one of my 20 gallon aquariums and it has some easy plants. The current bulb sucks.
I know the ideal kelvin rating is 6500k-6700k but would 4100k b ok? I know Dustin, from DustinsFishtanks uses these bulbs. Could I use them?
I have a 100 watt CFL, 500ish k bulb on my other 20 gallon and the plants grow extremely well.
 

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I'm sure you can use that bulb. The question will be, for what type of plants are you going to use it for... I was using 6 75 watts curl cfl at 2700k I guess and they were doing ok for my plants. See picture.








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Could I use them?
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Sure.. why not
For reference since I love "visuals"..


8000k Sylvania FO32/SKYWHITE/XP 'Sky White'
6500k Philips F32T8/DX 'Daylight'
5000k Philips F32T8/TL850 (sometimes called 'Sunlight')
4100k Sylvania FO32/841 'Cool White'
3500k Philips F32T8/TL735 (no real name, i call it 'Semi-Warm White')
3000k Philips F32T8/ADV830/EW 'Warm White'
2600k GE F32T8/RVL/ECO 'Reveal'
http://www.lighting-gallery.net/gallery/displayimage.php?album=1574&pos=76&pid=51785
 

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Kelvin is not what I would call an actual point saying that all the light is that frequency. I think of it as more of an indication with some on each side. So a 6500K might be the "best" but still much of it is 5000 or 8000 maybe. I think of it as more of a sloppy average. Sliding on the rating from 6500 to 5500 should give us an indication the main frequency is lower but does not mean it will not work. Just work maybe a little less well if your plants are of a type which required 6500? Natural daylight varies a good deal so it is not a great big thing when our lighting varies.
 
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