How can you tell PC Bulb Life

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SGH360 Members Profile Send Private Message Find Members Posts Add to Buddy List Guest Joined: April 04 2010 Location: Centerville, UT Status: Offline Points: 1786	Post Options Post Reply Quote SGH360 Report Post Thanks(0) Quote Reply Topic: How can you tell PC Bulb Life Posted: August 17 2010 at 3:16pm
	I was wondering how can you tell PC bulb life? I just purchase a fixture for my FW 30G its 55W 50/50 and it looks brigther than my 130W PC of 29G my reef

Will Spencer Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Joined: September 04 2003 Location: West Jordan Status: Offline Points: 6799	Post Options Post Reply Quote Will Spencer Report Post Thanks(0) Quote Reply Posted: August 17 2010 at 4:59pm
	Typically you figure after a year the bulb has lost 50% or more of it's photosynthetically useful radiation. Some say you should even change them every 6 months. The only way to tell for sure is to measure PAR with a PAR meter and when it falls below the amount you require then replace them. Usually you would measure when the bulb is new and then again every so often until the PAR is reduced to around 50%. Even 50% may be less light than you need depending on your tank and what other lighting you may have.

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