Simulating Light Energy Savings

It is the ratio of luminous flux on the surface considered to the total luminous flux given by the device.

So, the answer to your question would be "yes".

I had never heard this term before but, like magic, I did a Google search and, voilla! I had the answer in under 2 seconds. _{(don't you wish YOU could do that!)}

Yes, that's right!

I read theah 100 times, but I did't notice "total flux"!

Thanks Mikerho!

I recommend not using a dimmable ballast (didn't even know they exist or work). Instead turn off and on tubes; i.e. most lights have 4 tubes, so when the sun light is high enough turn off a number of tubes entirely. This way you have the tubes running at their highest efficiency and will avoid having a lot of flicker which usually happens when the tubes are not run at full current. This is also easier to do because transistors/relays are cheaper then dimmers.

It is often frist glance and can save more energy than dimmable electronics (maybe), but frequently switch lighting on and of can significantly reduce lamp life. Therefore exist a variant of the on-off control know as "differential switching".