hammerhead- a question - as stated i have '2' hydro crunch 315's setup's (hood/ballast and bulb) i want to swap out these bulbs for the phillips 3100- online there seems to be 1/2 dozen diff phillips 3100- is there one that is better then others?? - and seeing the back n fourths ref open/closed hoods, i'm going to reinstall the safety glass the hoods came with- ..thanks in advance