If you have a 400 watt hps, why not just put them under there asap? Germinating seeds in soil don't need light but as soon as they break through, I'd have the 400 on them. Not only that but it saves you effort of trying to find something else for the first few days.
The Grim Reefer Reviewed by The Grim Reefer on . Quick Question bout 20w light! would a 20w light be ok for growing from seed? Thanks! :) Rating: 5