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Old 09-13-2014, 09:25 AM   #11
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I've seen both of these. 150w each I believe
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Old 09-13-2014, 10:05 AM   #12
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Hydroponic lights work great for plants, hence why they are used to grow plants. The red/blue/white combination varies from product to product. Generally speaking, aquatic plants have the same needs as terrestrial plants. The issue is in the aesthetics, they typically aren't all that great to look at.

Whichever ones you end up looking at, just have a good look at them in operation and try to envision whether you'd want your tank to look that way.
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Old 09-13-2014, 11:33 AM   #13
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There is a DIY section in the BML website where you can put in LEDs for each spectrum and see the spectrum change/loss by depth. Quite fun to play with.

I'd agree they can take a lot of getting used to, especially if very high in reds.
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Old 09-14-2014, 01:24 AM   #14
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Do I just need blues and whites? Attachment 249884Attachment 249885

Blue/white is what I have. Prices have really gone down the last year too. SuperMart on eBay had them $125 each last year around the holidays (when I got two) and they are close to $75 each now. I'm thinking of getting four for my 240g now.


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Old 09-14-2014, 04:32 AM   #15
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Not true that those "red or blue" lights cause algae. Aquatic plants need a good mixture of reds and blues. Normal fluorescent bulbs have both of these but you need a 2/3 ratio of reds to 1/3 blue. You probably will not see the reds of blues but it is on the bulbs descriptions. The reason for it is the reds need to be a longer wavelength and the plants absorb it faster than the blue, which is what gives it it's color. But when the red is not absorbed as quickly as the blues are, that's when you start to promote algae growth.

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Old 09-14-2014, 09:43 AM   #16
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Hydroponic lights

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Originally Posted by AdamsAquarium View Post
Not true that those "red or blue" lights cause algae. Aquatic plants need a good mixture of reds and blues. Normal fluorescent bulbs have both of these but you need a 2/3 ratio of reds to 1/3 blue. You probably will not see the reds of blues but it is on the bulbs descriptions. The reason for it is the reds need to be a longer wavelength and the plants absorb it faster than the blue, which is what gives it it's color. But when the red is not absorbed as quickly as the blues are, that's when you start to promote algae growth.

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Not true that "red or blue" light won't cause algae. If you were in the Freshwater section, that'd make sense but this is in Saltwater and it's a bit different. (It was originally posted in salt because it was supposed to be a cheap alternative for coral light). Too much light period will promote algae no matter the spectrum.
Red, Yellow, and Green that make the 6,500k look will promote algae more. You also need excess nutrients though.
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