I wouldn't call green "worthless".
It's just low efficacy.
Takes a lot more of it to do the job.

I just use two wavelengths, red and blue.
Most strains do quite well with that.

I have played with other wavelengths, but for energy efficiency, I've settled on 635/660nm. red and 460nm. blue.
I use a dimmer to vary the ration of red to blue to control morphology.
2 colors will usually do.
Try it, I think you will like it.

If your strains abstain, throw some white light at them to see if they still complain.



Aloha,
Weeze