Hi Carl,
I'm using 12 w spot led lamps, 1w each led. I'm using also a Philips mastercolor cdm-r lamp 70w , almost good for colours but not so much for the growing, plants grow a bit twisting and weak, and without nectar production. Where this year I place the led lamps instead of another mastercolour, plants are growing higher and stronger. Now I would like to add more led lamps because their problem is also the few spread of light, but I need a solution for the colours.
Here you can see some photos of plants in my "terrace bog".
Ciao
Marco