Old bulbs = Algae problems?

[bongy]

Hi guys,

You can look at my tank to compare the two Iwaski bulbs. The yellow tang side is the new one with 'R'.

http://www.canreef.com/phpBB2/viewto...=4071&start=15

They are 250watt with 2 VHO actintic. The new one is around 15 months old and the old one is about 2 years. I read somewhere that Iwaski last longer than the other MH bulb without noticably shift in spectrum. (Something like 2 years if I remember correctly)

Hopefully, the old one will last till boxing day this year so I can get new one.


Bongy