Light Timing Help plz

Has anyone ever tried changing lights from 18/6 to 24 on during vegging? Cuttings need 24 hr light and the veg room lights are only on 18. Can they be switched up and stay on constantly without harming the others?

Thanks

Clones work fine with 18/6 lighting. CFL's work very good without heat stressing them.

i would runn it 18/6 for all veggin except for revegging there imho 24 for the first while is best .. and i remem reading a while ago during lights off the roots develope the most compared to when light are on .. but i havent done a side by side to test it .. anyone tested this ?