Uggg...
No.
Just no.
You want to use your 1911 with a white light? Learn how to shoot with a flashlight.
You want rails, get something else.
*shudder*
(seriously, though, a 1911's countors make shooting,with one hand more then doable even with smaller hands. One reason I like 1911's so much is the grip profile. Once you take that away, well, you've lost a lot of what makes it good. I can find plenty of pistols with rails that will fit me fine, and if I want a rail I'll get one of those)