Well under an inch is too close. 1.5 inches, LIKE I SAID HOW I HAVE IT! is perfect.
And when i say what people are saying is bullshit, I mean they are saying stuff that they may have witnessed in their life, but what they dont know is it could have been a multitude of different problems. I am telling you, from what I have read and what I have experienced, if you do everything perfect, then you can keep your CFL lights anywhere around 1.5-3 inches away with no problems at all.
If your referring to me, sprouts leaves are usually either green or emerald green (World of Warcraft Emerald green, if you know what I am saying ahahaha)