ujm- bekitzur, yes flipping on a led light is a drabonon according to rov poskim – ( the term drabonon is equally asur) , all original poskim agreed that turning on electricity was/is asur the question was under which melacha category it fell into . specifically incandescent bulbs had a filament that glowed red hot . the chazon ish had a unique approach & always considered opening & closing a circuit to be boneh deoraysa . then came rav shlomo zalmen zatl & studied the practical aspects in depth and differentiated between appliances that had a heat element ( deoraysa) to things like an fridge or a fan ( drabonon ) many poskim have followed this mehalech. at least as far as using a goy considering it a shvus deshvus, much more on the topic ….
