Anyone know which bulbs have the best par ratings? I've been searching around and I'm finding it difficult to sort through all the information.
I would like to use cheap UltraSun bulbs if possible, and can get 4200k 400w bulbs for $15 a pop. Can't beat that. But I'm looking at the spectral distribution charts from UltraSun and they have the exact same chart for their 7,500k bulb as their 4,200k, at least at 400w. The 1000w charts differ. It's also worth noting the 7,500k bulbs are ~2/3 more expensive.
The tallest peak in both charts is in the green spectrum which will certainly not provide much plant usable energy. The current plan is to run stacked bulbs in a donut. A 600w HPS over a 400w MH. Maybe mixing a bluer bulb with a red HPS may be better, or maybe mixing a redder MH with HPS could be better... This is going to be an experiment of sorts, but I'm looking for any extra info anyone has.
Here's a link to the charts in question:
400w 4,200k
400w 7,500k
400w 10,000k
I would like to use cheap UltraSun bulbs if possible, and can get 4200k 400w bulbs for $15 a pop. Can't beat that. But I'm looking at the spectral distribution charts from UltraSun and they have the exact same chart for their 7,500k bulb as their 4,200k, at least at 400w. The 1000w charts differ. It's also worth noting the 7,500k bulbs are ~2/3 more expensive.
The tallest peak in both charts is in the green spectrum which will certainly not provide much plant usable energy. The current plan is to run stacked bulbs in a donut. A 600w HPS over a 400w MH. Maybe mixing a bluer bulb with a red HPS may be better, or maybe mixing a redder MH with HPS could be better... This is going to be an experiment of sorts, but I'm looking for any extra info anyone has.
Here's a link to the charts in question:
400w 4,200k
400w 7,500k
400w 10,000k