Well, I have major light leaks in my closet and have managed to sort out 50% of them with some skillfully placed Mylar. Still theyre only Lowryders, so it doesnt really matter...

And no, the 14w CFL wont cause any problems whatsoever. MJ plants that grow in the wild have light leaks each night from the stars and moon, and they do just fine. Incandescents DO deliver lumens, but theyre in the wrong spectrum, which is why plants stretch so much under them. I wouldnt worry about small light leaks; they can be sorted out with some tin foil anyway (remember, use the dull side only).