its something to do with Part L
http://www.lllwww.co.uk/building_reg.html
but this may only be new builds?
reading this I assume if the fitting exceeds 45 lumens per watt there is no limit? (table 42 page 81 of attachment)
my fitting is 17000 lumens at 150 watt on the front
jpw-partl.pdf
i believe there is a 150watt limit on flood lights?
is this domestic only or does it apply to commercial too. Only asking as i want to fit a couple of 200 watt ones in the back garden.
while i think the op is working for hik marketing in some way as h hasn't noticed ill ignore it.
i like app stuff i want to see it extended into our world not left to diy nest stuff etc