New Bulb Needed!!

[marinelife]

I have a Mogule Base Metal Halide 400w 20K Radium Bulb on a PFO HQI Ballast. I want something different because I have to change these to much as they loss their blue and intensity. I was thinking a 14 or 15k but what bulb would run on my PFO HQI Ballast

 

[Krish]

Not sure on the HQI Ballast, but here's a bump

 

[twilliard]

Not sure but isnt the "HQI" ballast a DE ballast. So in reality you can drive any lamp (not sure about pulse or probe start though).
If its a true HQI ballast will it overdrive the SE lamp?

hmm well here is an artice on lamp comparisons with ballasts.
http://www.advancedaquarist.com/issues/feb2004/feature2.htm

 

[marinelife]

Thanks for the link, I guess I can use about any bulb but I guess I will have to research which one hold its color longer, I want to stay on the blue side but not the radium as it is white after 3 months

 

[twilliard]

My Hamilton 14K lamps do the same thing. They turn white after about 4 weeks though.
Looking into different types also

 

[marinelife]

hmm that is what I do not what, I want one that stays blue longer, maybe I will have to change out the ballast as it is a true HQI