perhaps i worded that a little confusing... I know the difference between Wattage, and The Kelvin temp... The new lights are 55 Watt 2700K, the old ones i dont know what the Kelvin temp is, but they are 100 Watt Cfl's (yes a 100W eqivilant) And i have decided to use the 2700K bulbs instead of the HPS, the HPS puts off too much heat. The 2700K CFL's are supposed to be close to the same spectrum.