when to change light bulb??

[taz_boy]

just a query.....
i bought a 2x36W PL light abt 3 months ago,
normally how long such a bulb last?? as in brightness, light intensity....
how do we gauge when to change....
assuming on for 8hrs a day, normally how long u guys will use b4 changing 1 new bulb??
anybody have any experience to sharre?

[StanChung]

just a query.....
i bought a 2x36W PL light abt 3 months ago,
normally how long such a bulb last?? as in brightness, light intensity....
how do we gauge when to change....
assuming on for 8hrs a day, normally how long u guys will use b4 changing 1 new bulb??
anybody have any experience to sharre?

3 months still ok,
six months do this simple test...

first, buy a new one[keep as emergency spare]
use this to replace one of the old ones, [turn on and compare with the old with new]
not much diff means you can put back the old one and keep spare till next couple of months to test again.

depending on brands most need to be replaced every year.
if kiam siap or puurse tight change one at a time. good idea to do this too because light change affects algae growth if you don't up the co2 with stronger light.

[taz_boy]

thanks.....very good advice...

[StanChung]

thanks.....very good advice...

tembak only with some common sense