OK so you have them in good let me ask this,, my T8s are 10 feet in the air. has anyone tried the LEDs up that high?
Skeets,
not making this complicated, but the distance of the light from the floor is really huge! At 1' the "brightness" = x .....if you move it to 2' the light now is 1/4 of the original! and then at 3' it is 1/9 of the original light.....and so on.
look at this page to understand more about :
http://imagine.gsfc.nasa.gov/features/yba/M31-velocity/1overR2-more.html
so if you were to hang your lights down from a 10' ceiling to lets say 7' ....the light would be almost twice as bright.......but then again, thats why the ceiling was built at 10' - right? more headroom!
But to answer your question - the "light brightness" with LED is rather impressive - I would say you will see MORE light........one reason, as the T-8 get older they seem to ....."dim" and the ends darken and loose a little bit of light....where as the LED will be the same until the LEDs quit entirely!
I was in SAMsClub yesterday.....they had the 4' LEDs for 37 bucks.......I wanted them, but I figure -- by next spring when I need em - they will be cheaper!!!!