First hours on the clock.

On Sunday afternoon, I replaced the Thorn Gamma 6 on my back patio with another lantern and while I was at it, I thought I may as well add some meters to see how much energy it uses and how many hours it runs for.
This was on Monday morning a few hours after the lamp had switched off.
It seemed to use about a kilowatt in 14 and a bit hours which means the total system power of the 50w SON lamp plus gear is about 70w.
Probably a bit high but then again my voltage is quite high at 248v during the day and as high as 253 at night!