I have 48" Nova Extreme Pro T5 6x54W bulbs. I want to replace the daylight bulb, the light spec said 3 10,000k daylight bulb and Ati only made 12,000k daylight bulb. Can I replace the 10,000k daylight bulb with 12,000K? Please advice.
Shouldn't be a problem. The aquablue is a crisp white with a slight hint of blue to it. You'll see an increase in PAR also in you're replacing the factory bulbs.
If you're still running the factory bulbs, I'd replace the current blues with the ATI blue+ while you're at it.