0 light works for me and cfls are really good for rooted clones ones rooted, even the old t12 will grow babies, and it possible to do things wrong for 16 years. trust me.
different stroke for well what ever.
0 light and you dont want the clone to become dependant on the humidity for moisture you have to make condition that makes the clones want to make roots, i take the doom off for 6 hours a day.
believe it or not you can keep cuttings alive for like 3-5 weeks without rooting, and this is done with humidity and 42degrees, darkness.