I believe these LEDs are strong enough to grow weed. I suspect I am waiting on the Canadian Post for these lights, I am anxious to try them out and make sure they fit properly in my light fixture and they work as was stated on the website. Growlight.ca also sells fixtures called Fusion Bright which are T5 Fixtures.
Right now my pepper plant seems to be bushing out, rather than growing into the light. I am using 2 blue and 2 red LEDs, arranged 2 red in the center rows and 2 blue on the outside rows. I may have to change the plant layout, 1 plant under a 24"(61cm) x 12"(30.5cm) fixture. The plant is also prolific with flowers. Growing under LEDs is new to me, so am using the learn by doing method.
I am also growing a pablano pepper from seed, I want to see how it performs grown entirely under T5 LEDs. Right now it has germinated and has it's first set of true leaves. Actually, additional leaves are appearing.