Green lasers are the rage this year in weapon-mounted lights. Why? If you were to set a green laser and a red laser side by side in a dark room, you'd hardly notice the difference. The green systems really shine in daylight or moderately bright environments. Our eyes see images in a defined spectrum from near infrared to near ultraviolet. Red is at the far edge of the spectrum close to infrared. But green is right smack dab in the middle of that spectrum, which is the most efficient frequency for the human eye. Read "Lights and Lasers: It's Easy Being Green."