cfls are nice because os the heat issue, but they will drive your electric bill the same as or if not worse than hid if you are counting lumens per lumens for watts used...hid lights are really more cost effective for the light that you get....right now your lights are pulling 772 watts and giving you around 35,000 to 40,000 lumens...with a 600 watt hps or mh you are only pulling around 670 or less with light and ballast and you get around 90,000 lumens....thats double the light energy for less watts.....