On Sat, 28 Apr 2018 11:28:21 +0100, Harry Bloomfield wrote:

I wasn't convinced - The LED was only a little more than half the lumen
output of the 58w tube.

You're forgeting the log response of your eyes, halving the power is
only just perecptable. As I've mentioned before and the Aldi 5' 22W
2000 lm LED tubes I could barely tell the difference in light level
between the LED and previous 58W 5' florry.

The spread is as near as damn it identical to a florry as well.

Power economy was not a consideration, ...

With a light that isn't on for long (total) per day that's sensible,
but with a occpancy switched light the total on time per day can be
higher than one might expect. But with only a 20 W saving pay back
via power saving will still be long.

... rather the problem was tube life with all the on/offs.

This is the gamble, if the LED costs three times the price of a tube
but last 4 times longer...

--
Cheers
Dave.