Subject

At one time in a past life I designed and sold a lot of lighting systems .

From that perspective, will off the following:

What you want to buy are lumens delivered on the surface you want to light.

By definition, one lumen per square foot = one foot candle.

What you pay for is KWH of electricity.

The lighting system converts KWH of electricity into lumens.

The more efficiently it does this process, the better the lighting system.

Trying to compare the inital cost of various componets is meaningless
with out also including the cost of installation, annual hours of
operation, efficiency of the lamps, cost of KWH, and the dirt factor of
the space you want to light.

Not exactly a simple problem.

Ya pays your money, ya takes your pick.

Lew