A few PAR readings on Hamilton bulbs.

[dannybradley]

This is more fiddling than science, but it's still a little useful.

I replaced some 8 month old Hamilton 150w 14kk HQIs with some new Hamilton 10kk HQIs on a AGA 120 tank LPS and softie tank. I decided it was a good time to whip out the quantum meter. The lights are probably 8 inches off the water and going through a glass top.

14kk 6 inches depth: 50 PAR
10kk 6 inches depth: 180 PAR

14kk 22 inches depth: 14 PAR
10kk 22 inches depth: 50 PAR

We can see that the 14kk does penetrate the water column better than the 10kk, yet the 10kk is significantly more powerful.

I checked on some 12 month old Hamilton 14kk 400w Mogul bulbs today that are about 12 inches off the water using Hamilton retrofit kits. I hit 70-80PAR about 6" under the water directly under one bulb.

 

[skriz]

Actually, they both have the same percentage drop off in par.

 

[dannybradley]

It's close, but the 14kk has the edge on penetration. It's by .01, but it's still in favor of the 14kk.

 

[skriz]

DannyBradley;107850 wrote: It's close, but the 14kk has the edge on penetration. It's by .01, but it's still in favor of the 14kk.

i think it's more like .0022222222222222222222222222222 :tongue2: