In Bill Moinihan writes:

I think the solution I came up with, which fits into a fixture with T8
ballast, is hitting me on both:

A. I don't see how it saves energy yet, since it's the same ballast
B. The T8 LEDs may burn out far more quickly since it's a T12 ballast

On the first point, I admit I'm confused.
How can it save *any* energy, if the ballast is the same?

My head hurts on trying to figure out just how a legacy
ballast can worh with a retrofitted LED tube, but
they do. I've installed a few of them.

I measured the before and after using a Kil-a-watt brand meter.
Don't have the paper here, but the measurements were something
like the following.

twin "40" fluorescent fixtu

Ballast only w/no lamps: 12 watts
Ballast w/both lamps: 84

Retrofitted with a "drop in" LED:

Ballst w/LEDs: 60

Light output was higer with the LEDs.

Again, these are NOT the exact numbers,
but there definitely was a savings when
using the drop in replacements.




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