wow that is a lot, lol, for my seedlings I got away with, and did well with just 4 CFL lights.. but they were 100w eq at 6,500k and I think they were 2,400 lumens each, and I was really just trying to get them started, and had good window light too, so I didn't really worry about it to much, and didn't want to spend the money
but fathual, I would honestly just return them.. unless your really broke,(but I don't think it would be a whole lot more than what you spent so far, and would definitely be well worth it) but I would return them and just get 4 CFL lights for now, and those work shop lamps (the sockets with the reflector domes, and clamp attached to it.. just take the domes off and use the sockets.. or you can go to lowes and I think they just have the socket and wires.. I saw them the other day and wished I had got them instead of all the dome reflectors which I just ended up taking off) and that lasted me (I also had some window light too during the day) but it lasted me till I needed to re-pot them into 1 gallon pots, then it just was a matter of space, but that was about a month to a month and a half later I think after sowing seeds.. so you would be fine by then as far as weather.. just get some emergency blankets and if you don't have a shelf, use a cardboard box to just put the emergency blankets onto to get as much light reflected back onto the plants.. and if you have a southern facing window.. even better