My PT92 is my nightstand / S.H.T.F. gun. I have a Laserlyte "Q.D." (quick disconnect) laser mounted on it. It was about $125 at the time of purchase. It seems to be fine. I do re-check the Zero every 100 rounds or so.
I won't mount a white light because that would mean breaking at least two of the four basic safety rules. #1 Never point a gun at anything you don't wish to destroy, and #2 Be sure of your backstop.
I have a Maglight for the off-hand to identify any potential target. It would be a shame to shoot the cat.