Question about bulbs

A question from a fellow grower:

Hello, I purchased the sun system 8inch ac/de lights for my flower room and can’t seem to figure out what I’m doing wrong. Buds just don’t seem to get as big or dense as I got with standard hps. I try to keep my hoods 24-36" above the canopy. Running them with the green galaxy dimmable ballasts and ushio pro plus bulbs at 1100 watts with 240v.

Have you had the lights compared with a PAR meter at the canopy? Are you running these lights at the same distance as your previous lights? And are they the same wattage as your previous lights?

Happy growing,

MacG