What color spectrum for freshwater live planted tank?
Spectrum measure in Kelvin (K) really isn’t a great method of determining the quality of a bulb for plant growth. Spectrum is just a measurement of how our eyes perceive light (higher Kelvin ratings are blue/white, lower are red/yellow), not what is actually being emitted. Many bulbs will show a graph of spectral output (like this: http://76.164.194.49/images_templ/light_… ), which are what you really want to see. Peaks on the bulb emissions should closely mimic the specra used by plants for photosynthesis ( http://users.rcn.com/jkimball.ma.ultrane… ). A spike around 550nm and 780nm is ideal for plant growth, but you also need green light for the plants to actually appear green, so there should be at least some emission from 500-600nm. Most companies’ 10,000K bulbs will actually have very di
