Thanks, wasserscheu.wasserscheu wrote:Very impressive work on your tankshx wrote: ... They are good enough to make a big difference visually, but I'm being told they don't make it for the plants. ...
Regarding the LED tech., this chart shows the plant-growth-relevant efficiency of variuos lamps. It's measured in 2 approaches. The summary states, that you need approx. 30 LEDs (Cree XR-E Cool White) come near a 36Watt lamp. But in general, the light of those LED measured in that project, in regards to plant growth isn't all that bad already.
http://www.hereinspaziert.de/Sehlicht_2 ... bnisse.htm
In this chart the above author shows the growth-relevant output per Watt for LEDs
http://www.hereinspaziert.de/Sehlicht_2 ... -LED_b.gif
I use some energy saving spots with integrated reflector where I need more light and have little space. They work fine.
And thanks for the charts, too. Surprising data, actually.
I knew we are not far away from getting competent LED technology.
I use pc spots for extra light as well. This tanks is showing moderate to good plant growth with 6 x 28 w t5:s and a couple of 30 w (combined) spots.
LEDs are definitely coming.