Intensity of a CF actually decreases by 30% within the first 3 to 6 months. The variance in time is due to manufacturing differences.
After that it levels off exponentially until "death".
So why change early ?
Well, if you have calucated your WPG (watts per gallons) based on the full rated output of your lights, then depding on your original target of either 2, 3, 4, 5, or higher WPG, you may find yourself on the low end of what you thought you had after 3 to 6 months.
Always take this into account when setting up your target WPG.
* Eheim Pimp Club Member No. 97 *
65 gallon, Eheim 2128,Eheim 2026, Hagen surface extractor, 18 watt UV Turbo Twist, M3 Pressurized CO2, 5 lb CO2 tank, AM 1000 Reactor, Laterite, river gravel mix.
90 gallon under construction. Eheim 2128, Eheim 2026, Coralife 4x65W, AM 1000 reactor, JBJ Pressurized CO2, 5 lb CO2 tank, Turbo Twist 6x UV, No substrate yet.
AGA Member. The Barr Report Member.
Last edited by Jackfrost; 12-18-2006 at 01:10 PM.