MH bulbs

[Skimmerking]

Originally Posted by howdy20012002

I have a question...
For MH bulbs, do u wait to change them once they burn out?
Or do they lose their wattage as they get older like PC?
If yes, how often should u change them...my 90 came with the used MH bulbs and I am not sure how old they are.
As well, is there really that much of a difference in the different brands of bulbs?
Thanks for the info
Neal

Neal If you ahvea ots of really nice corals then I would switch them out and ensure that you are having the lighting period shorten or have some type of cover like screen to put over the tank with the stronger bulb will bleach some of the tissue in the corals like SPS. I know if you are going to a higher Kelvin bulb then you need to dull the light some how like using screen like I have already stated. If you are going from a lower kelvin bulbs liek 10,000k to a 14,000 or even a 20K then its not as important...

HTH

but I think that others have posted the same answer or better ones then mine....