No you induce flowering usually when they are 4 or more weeks old

IMO I would turn your lights on 24/0 or get a timer (your going to need one for flowering anyways) and set it to 18/6 and let them grow for another week or 2 too get bigger and stronger and to let them get use to a constant light source. Then set your timer for 12/12 (12hr on 12 hr off ) to induce flowering. Also get the lights as close as 2"to 3" from the top of your plants

As for your worry about burning down the house. CFL's produce so little heat you have nothing to worry about ( you could place a paper towel directly on one for days and it won't burn )

GL and Happy growing
Jerry Garcia 2007 Reviewed by Jerry Garcia 2007 on . How much Light? so im a first timer and i have a few 150watt = 40 watts powered cfls. only one kindb plant and seems to be coming along nicely. but being outa the house alot i dont leave them on all day to avoid the potential ofa fire hazard. mostly all night from 12am-10am. my question is how much light should i give him daily? i am pretty sure that the lights should stay on all day. any help towards this matter is much appreciated. :) Rating: 5