i know the light cycles but i have seen leds using red and blue at the same time,and my weed is 11weeks flowering,can i use both lights but at 12/12??
I'm not sure what you mean by both lights, if you mean HPS and CFLs, yes, you can use both together, this can be useful for lighting lower parts of the plant that the HPS light is not getting to because of distance/shading.
coz the thing is my tent is 2m high-stand is 30cm h.+pot another 30cm h.so im loosing 60cm h. off my space-that leaves me with 1.4m h.
Simple answer, start flowering at 18-20" tall, they should top out at around 3-4'.
and minus the space for lamp will be tight coz my mothers in flowering got allready 1.3m.
is it safe to use 2*400hps coz im bit worry about the energy consumption ,cfl are energy saving but is it worth it??
CFLs are marketed as energy saving compared to the incandescents most people use to light their houses. As I said in my earlier post, they are much less efficient than a good HPS. If you wanna save energy, go with cfls and use as much wattage as you feel comfortable using. If you wanna grow killer weed, go HPS
lumens are v.importent i know that but wiil there be a big differenc in yeald with cfl than with hps??
For equivalent power consumption, yes.
and those are my girls
peace