I keep reading on surefire.com that the light can be used as a self defense measure by blinding the attacker, ruining his night vision*. Does anyone here actually know how many amps you need to induce this?

*with night vision I mean street light adapted vision… not full blown desert darkness.

Can you recommend other, cheaper companies which make torches advertised with this function? Like night lite from BHI, do they mention which are bright enough?