Glock GTL 21.
I wish it was an LED rather than Xenon but that is my only complaint. I have the CR123A batteries that came with it when I bought it a few years back; that is how little I use it. I mostly just check the zero of the laser once or twice a year, or flip on the light when I hear a "bump in the night."
The light is plenty bright but, again having gotten used to LED lights, appears a bit yellow. It has no focus but it really isn't necessary. I prefer my Streamlight TLR-2 but, since I consider a pistol a back-up weapon, it is mounted on my Sig 556. The Streamlight is superior but for just a rugged and ready light/laser combo that won't break the bank and is plenty bright for out to 25 yards (no focus so the light tends to scatter past this distance) then I recommend the Glock GTL21. The GTL 22 is dimmable.