Its not the lumen's issue at all. You need to get the lights closer to the plant. The closer the light is the tighter/bushier the plant will grow. If you continue to let them stretch out growing, the stems will collapse and they will simply fall over and die. They are ridic stretched.

Do you have a fan placed on them currently?

If your finger isn't burnt by the lights the plant leaves won't either as a rule of thumb, the plants are very resistant.

Lastly I'd say if you want to know how my CFL/Floro grow ended up check this out.

http://boards.cannabis.com/grow-log/...g-you-kid.html