Quote:
Originally posted by kangym
The par readings does not look too bad at 9 months old. When will you think it is time to replace with new bulbs? The par number or coral growth?
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WOW! Nice tank.
Watch for the color. The spectrum of the lamps shifts with age. Guys in europe were changing lamps at about 8 months because after 9 they noticed a change in color but at that time they didn't have the good reflectors or active cooling so they were really pushing things.
Your PAR numbers still look high enough BUT how much do you want to shock the corals when you do put new lamps in? You don't want to let them get so weak it is a huge shock when you do change them, One thing you could do is put a new blue plus in and compare the look to an existing lamp. If there is a big difference I would go ahead and relamp. If not let it go a month and check again.
When you do decide to change lamps I would do 1 a day so you aren't hitting the corals with additional light all at once.