New Invention (via Protocols)

The kosher lamp.

Basically, its a shade built into the lamp which allows you to dim or "turn off the lamp," in an absolutely kosher way. Useful when you are done reading in bed on Friday night.

I don't know enough about the halachot of shabbos, something I'm currently trying to remedy by learning yerushalmi shabbos, and the other day I encountered a gemara that stated an issur to read by a light on Friday night, *an issur that applies even to non-adjustable lights*. Associated with this, the chazzan haknesset cannot daven by a light on Friday night but can point out to the youth where to start reading. This is obviously not current practice, and I am now interested why, and how this figures in to the halacha.