Which Light to Use

I have a 4x4 hut with some ladies flowering right now. I have a 1000w eco inside sun ballast which uses a cheap light. Ive used this light a couple of grow so it does have some hours on the bub. I also have a new 600w digital ballast that is running a new hortlux bulb. The temps with the 600w are around 80f and the 1000 they are around 85f. Which light should I use? with the results be that big of a difference?

the 1000 will have better light intensity wich will mean more light to the lower bud sites and a better yield, however growing style should also be considered cause if you are doing a sog or scrog the 600 would probably yield just as much as the 1000, as the canopy will be more even and the plants will be shorter so the increased light intensity of the 1000 does not really help.