New Grower CFL's how far from plant?

[WEEDOSHI]

I'm currently keeping mine ~2cm away from the plant. The pc case has a fan blowing any hot air away, so i dont think i should see any burns. Is 2cm 'okay'? or should i move it to 4cm - 6cm?

Thanks everyone!

 

[bud head]

I try to keep mine apx 2-4 inches from my plants