I keep being told I don't understand so lets see how much I do understand.
Lets keep it simple for me since I have a hard time understanding.
1 - You are not allowed to turn a light on or off
2 - If you achieve the same results without turning the light on or off it is allowed
Do I have it right?
WRONG WRONG WRONG
There is no prohibition, nor to the best of our undrstanding any intent to prohibit making a dark room light, or making a light room dark. (We can open/close curtains without any issues)
The entire prohibition is to ignite/extinguish a fire, and/or to create or destroy a circut.
If I created some type of indirect method of doing that(like the 'kosher' switch, that could be called (by some) a loophole.
Covering a light source is permissible, and never was the subject of any prohibition.