Blueist 20k bulb

[reefinallday]

What bulb is the blueist 20k 400w bulb made? Dont really care about best bulb as far as strongest, since i do not have sps.
Please only responds from those that have used diff bulbs.

 

[ssbreef]

prob the radium

 

[leeweber85]

iwasaki has a 50k I believe