I’m a light switch!

You see,
when I‘m switched on
everything turns bright,

and when I’m switched off,
I become one with the darkness

I could be
too bright at times,
or a an utterly dark self

It’s hard to recognize me
when it‘a dark, I’m unseen

But I can’t recognize myself
when it‘s bright, I’m blinded

All I need is the a
trigger to turn
a bright room
into a graveyard

So please be more
careful with me

I am a light switch