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Hey everyone,

Quick question on LED color distribution for planted tank lighting.

I've seen each of the following statements made online, many of which contradict one another:

  • Red lights should take up at least 50% of your LED spectrum, while blue lights should not exceed 15% (with the rest, of course, being white).
  • You don't want to overdo it with red lights, since having them on for a prolonged period of time will result in excessive algae growth.
  • Red lights are useful to the plants that they reach in shallow tanks; however, as blue light permeates further, blue lights should be optimized when lighting a deeper tank.
  • Shoot for 75% of your spectrum being composed by blue lights, 20% by white lights, and just 5% by red lights.
  • It doesn't really matter, as long as you don't overdo it with the blue lights.
Despite the internet being information-rich for most niches of the aquarium hobby's world, there seems to be limited discussion on this and even less consensus.

Does anyone have input on the matter?

Thank you!
 

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Pleco n bn breeder n BOSS
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Lights will depend on what you want to do with your tank. Do you want high light and co2, medium plants or low light.My low light tank has a lot of plants and just the stock white light that came with the hood. My other 2 tanks has a combo of white and blue with a couple of reds, but aren't as heavily planted. More than coloration what you need to look at par. There is a thread on par lighting on here, that you can do search for.
 
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