I saw some 70 watt hps's at Home Depot. But they need a mogul base. They have some 35 watters that put out 2250 lumens. For 4 of them you'd have $64 in them but they'll work in a regular base (not mogul). That way you'd have 140 watts of hps at 10,000 lumens. Not perfect but way better than all flourescents and the correct spectrum.