Ozdude Wrote:
wrote in message
ups.com...-
Hello,

How often do most of you change your CF bulbs? I've got some of the
long 55W & 65W bulbs that I've been using for about 8 months. I'm
starting to suspect a measureable decrease in light output from the
changes I'm seeing in my tank. Maybe I'm just paranoid...

Thanks!-

I've read but can't verify as yet (my lights are only 2 weeks old)
that
T8/T12's can diminish their output by as much as 50% in the first 6
months,
and the T8's and T5's can go 30% longer, so 8 months sounds about
right.

I plan on changing mine every 6 or 7 months, as I am quite paranoid
about
lumen, spectrum and CRI output for my new tank

Oz
--
My Aquatic web Blog is at http://tinyurl.com/6d5ju

most ppl use them till they burn out the plants can anjust to the
spectum shift due to "diminishing" i know alot of ppl running very
great looking planted tanks on 1-2 years old tubes, theres a bloke in
USA that happy takes ppls "old" tubes if they change every 6-12months
if u got the money change every 6 or so months but most ppl use till
they dead.


Gavin


--
nitromad