How much W of led or cfl lights do I need for my plant to grow?

I've always vegged under 3 23w cfls but just switched to 3 20w led bulbs because it's 1.5x as much light. This is for 2 plants in a 2 sq. ft tent, but I used to just use a white corner. You will need real lights for flower.
 
Depends on expectations. Lots of shit will grow a plant.

For professional production they use 40.3w Sq/ft of the best Samsung, and Osram Diodes. Samsung 301b-301h. Osram Red/Far Red
 
Don't waste your time with CFL except maybe a simple light for clones but even then some cheap LED bulbs would be a better way to go.

Cfl is the least efficient light we use in growing right now. If you want a lot of light for cheap go HPS if you want a more efficient long term investment get a quality LED, blurples are often less efficient than HPS
 
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