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Author Topic: fluorescent bulb selection question  (Read 3005 times)
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« on: April 12, 2017, 09:27:42 AM »

Hello all,
I am thinking to upgrade my lighting on my 75 gallon aquariums. They both came with a 48" reflector top and one T8 Full Spectrum bulb 32 watt (I think it is 8,000K but not sure). Although "adequate", I find the light to be a bit dim and yellowish. I much prefer the bright crisp white light I seem to get from the LED's on my 40 gallon. I was wondering if the Coralife tube T8 32 watt 10,000K with blue/white rays would be brighter and crisper? I did look at some lighting articles but it's just too much information to absorb - just want somebody to tell me please LOL. BTW, I only have some java moss and a few sprigs of elodea in there as far as plants. Also wondering what part lighting plays with brown algae, I do have a bit of that. Thanks!
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« Reply #1 on: April 12, 2017, 09:12:56 PM »

Hmmm, I don't recommend a 10K K tube for a freshwater tank. 5600K represents noon day sun and 56 to 6500K should be right for a 75 gal planted aquarium. 8K K is pushing it. If you can get a lamp that puts out 90-95 lumens per watt at 56-6500K, that will far better for plants in your tank than a 10K K lamp. There must be a compromise for what looks good to you and what is best for plants and fish. (Not to mention that 10K K is not even natural).  happy

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« Reply #2 on: April 13, 2017, 07:13:47 AM »

Thank you Rasaqua - I will stick with what I have then. Appreciate it! happy
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Tanks: 20- from 5.5 to 150 gals.
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« Reply #3 on: April 13, 2017, 12:04:55 PM »

While bulb temps are a factor, what really matters are two things, imo, espcially in T-8s. The first is spectrum and the second is CRI. This stands for Color rendering Index. Sunlight has a CRI of 100. The CRI rating of any bulb indicates how close to natural sunlight it will make things look in a tank.

Towards that end, consider this bulb

I have always like the tri-phosphor flours as they can be used until the burn out unlike lesser quality bulbs which usually need to be replaced yearly in planted tanks.


“Everyone is entitled to his own opinion, but not to his own facts.” Daniel Patrick Moynihan
"The good thing about science is that it’s true whether or not you believe in it." Neil DeGrasse Tyson
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