20000k 400w vs 6500k 400w

[wildbill]

Its getting time for me to change my mh's and I was wondering what everyone thought about the 20000k 400w osram bulb? I've been using the 6500k 400w for around 3-4 years, I tried the german 10000k 400w and coral growth slowed compared to the 6500k.

Bill

 

[ADS]

I have dual 400W 6500K with actinics over a 90g. I just ordered 400W 20K radium to put between the 6500K's. I want to get rid of the VHO's. I can let you know in about a week when the setup arrives.

 

[wildbill]

My mh assemble holds 2 power compacts, plus I use the e-line ballast's. I recently switch my power compacts from actinic to 2 55w 6700k super daylight bulb. It looks pretty good. I also have another set up in front of my MH assemble which holds 1 110w superactinic and 1 110w aquasun.

Does anyone know where I can do some reading on any test on the 20000k bulb. I recall a few years ago in Aquarium Frontiers there a multipart article on 175w,250w,and 400w bulbs. But the 20000k wasn't tested.

Bill