Actually your seeds would come out of the soil with no light at all,keeping them warm would be a good idea,but light isn't necassery until sprout comes out of soil!,but the faster you get a grow light of some sort the better the chance of getting the seedling to live......you don't have much time,and the sun may be to powerfull for a seedling just coming out of the pot,get a cheap flourecent bulb,even a few spiral flourecents for now,tie ya over for a few weeks until you can get something together with a little more bang to it...good luck