just wondering ..would i save electric if i used my 250hps instead of my 500w radiator. im using the radiator to get the temp up but its still only sitting at 21 and thats lights on, so was thinking bout adding the 250hps and maybe just turning the radiator half way down so that ill b using 500w in total but at least the plants b getting more light, or duz the electric not work like that ?