No more than you'll get from the muzzle flash in low lighting with a non-c model. Tritium sights are very bright and you shouldn't have any problem with a followup shot, but Lasermax is an excellent low light laser system that replaces the recoil spring on the Glock with an ambidextrous on off switch that replaces the takedown lever. There are several sites that have them for under $300. Lasermax also now has a green daytime laser setup that mounts to the rail system on the frame, nothing internal yet. As for the gun, they're failsafe and idiot proof and have been tested 10,000 rounds with no cleaning and no malfunction.