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Author Topic: fluorescent bulb selection question  (Read 946 times)
Sheralyn
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Posts: 71


« 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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rasaqua
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Posts: 733


I know where Russ's stuff is.


« 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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When one can't explain things simply, they just don't really understand it.
Sheralyn
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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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TwoTankAmin
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Tanks: 20- from 5.5 to 150 gals.
Posts: 342



« 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

http://www.zoomed.com/db/products/EntryDetail.php?EntryID=179&DatabaseID=2&SearchID=3&SearchContext=YTo2OntzOjg6IlNlYXJjaElEIjtzOjE6IjMiO3M6MTA6IkRhdGFiYXNlSUQiO3M6MToiMiI7czoxNToiUHJvZHVjdENhdGVnb3J5IjtzOjExOiJUOCBMaWdodGluZyI7czo3OiJIZWFkaW5nIjtzOjg6IkFxdWFyaXVtIjtzOjg6IlNlYXJjaF94IjtzOjI6IjI0IjtzOjg6IlNlYXJjaF95IjtzOjI6IjIwIjt9

http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=4489

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.

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“Everyone is entitled to his own opinion, but not to his own facts.” Daniel Patrick Moynihan
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