20k not blue enough

[Stones]

Most metal halide bulbs take approximately 100 hours of use before they are considered to be "broken in" and show their true colour output.

I've used many different brands of 20K bulb on my reef over the years and all of them looked closer to 14K than 20K bulbs I had seen running on other tanks. In my case, it was my ballast (PFO HQI) causing the bulbs to look whiter. When I switched to the radium 20Ks which were meant to be run on a HQI ballast, colour improved somewhat (still looks to be between 14K - 20K) and my growth rate also picked up.

[bv_reefer]

100 hours eh, i notice everyday it's getting bluer. ya fkshiu i wanted to go with radiums badly, but i'm using an m59 ballast ment for probe only lamps, so radium was out of the question, the reflector definitely picked up the stray light, so looks to me that it's brighter, either way i'm already getting wicked growth from all the corals so definitely no complaints, like my gsp's that were'nt coming out for weeks on end when i wa running my old hqi's. anyways thanx for the responses..