LED lights

[Rorschach]

I've noticed that when I turn off an Osram BC lamp it takes a significant fraction of a second to stop glowing - which may of course be stored energy in the supply and/or the persistence of the phosphors.

It's both, but mostly the voltage reducing circuity as it has capacitors in it.

 

[Woody2Shoes]

It's both, but mostly the voltage reducing circuity as it has capacitors in it.

And/or inductors which is why I used more generic terminology.

 

[XH558]

Try this............. I used "small detailed task" so the area will be pretty bright...........
https://www.omnicalculator.com/everyday-life/lighting