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shev · 10-16-2005, 01:41 PM

I think I have to disagree with simpte. the watts matter, lumens dont for a planted tank. lumens just measure how bright the bulb is to the human eye. the human eye is more sensitive to the green parts of the spectrum, making it seem brighter to us. but plants reflect the green part because they are green, and they use the red and blue parts of the spectrum. so even though it may appear brighter to us with more lumens it will be dimmer to the plants.

10-16-2005, 01:41 PM	#6
shev Senior Member Join Date: Jan 2005 Location: Montana Age: 19 Posts: 1,587	I think I have to disagree with simpte. the watts matter, lumens dont for a planted tank. lumens just measure how bright the bulb is to the human eye. the human eye is more sensitive to the green parts of the spectrum, making it seem brighter to us. but plants reflect the green part because they are green, and they use the red and blue parts of the spectrum. so even though it may appear brighter to us with more lumens it will be dimmer to the plants.