View Full Version : Phoenix 14K 250W DE life span?

06/04/2009, 12:30 PM
What sort of life span do you get out of your PHX14K bulbs? I have heard different things- 12 months, 18 months, color shift at 6 months, but I wanted to get a opinion since I know many of you use this bulb.

I installed my bulbs in October, only run about 5 hrs a day. Prior to this set, I had a set I got used, so I cant say the usage accurately, but when they went bad, I had a lot of issues in the tank. I want to be prepared so that doesn't happen again.

Also, where is a good place to buy them? I really like these bulbs, but open to suggestions for any bulbs that are bluer, but wil not slow my growth too much. Not sure there is such a thing


06/05/2009, 03:09 PM

06/06/2009, 01:20 AM
reefkepping mag in 2007 hasa great article on these over a 2 year period........best bulb as far as long term goes to me.....

06/06/2009, 10:18 AM
I don't buy into the 2 year thing.

Mostly everyting I've read says to change any MH lamp between 9 and 12 months.


06/06/2009, 10:46 AM
I would say do not buy into the 9-12 month thing that most retailers tell you *LOL*. Best way to know is to use a par meter to determine if the useful output has dropped to low. Personally I use MH bulbs for approximately 1.5 years before I look for a replacement. Never had an issue doing this. Heck I have a year and a half old set of phoenix bulbs here that I use as backups or loaners *LOL* still work great!

If you only use them 5 hours a day, then the lifespan should be a lot longer than 2 years as I run mine for 10 hours a day :)

06/15/2009, 07:42 PM
Garage, do you think the life would be double? Does the on/off affect the life, or just run time?

anyone else?

06/15/2009, 07:50 PM
I wish I knew a 100% answer to that. IMO, yes life would double as use is what ages the bulb. However I do not know how on/off effects a MH bulb.

06/15/2009, 08:29 PM
Every bulb is different but from what I have read on the Phoenix bulbs they lose 20% of there intensity during the first 6 months of standard use. Then 1% every month after. Mine have been burning for almost a year. Still look just as bright as they did. Need to get a par meter on them, but my coral growth is much better today then it was 6 months ago.