Laser sights are great, until you can’t see the blasted red dot because the sun’s too bright, or you accidentally left it on so the batteries are dead. Viridian has come up with answers to these problems . . .
They make a green dot laser sight, which is much more visible in bright light than red. In addition their retention holster extinguishes the laser when the weapon is holstered, but doesn’t activate the on/off switch so when you draw the laser comes back on immediately.
My permit-renewal class instructor actually had a DGU (his wife woke him up when an intruder reached under the covers and touched her). Fortunately he did not have to shoot anyone, but he was positively eloquent in his description of the effect an adrenalin dump has on fine motor control. In short, when you are in a SHTF situation, the last thing you want to have to try and do is fuss with a laser sight switch.
They are available with or without an integral tactical flashlight which also can be operated by their holster and you can download a catalogue from their website