before you buy your safety glasses, you want to decide what color your laser will be. I recommend blue lasers if you want to ignite things, but be aware that some things burn better than others with light. A new candle wick is brilliant white and all i managed to do was slowly disintegrate it, never igniting it. Meanwhile a newspaper went up in flames, a hot dog sizzled and popped while turning black, and leather looked like I took a wood burner to it. Basically the more white or reflective a material, the more power you will need to ignite it.
The color of the laser determines the color and chemical of the lens for safety glasses. Generally speaking, Blue lasers and red lasers use opposite colored lenses. Green laser goggles don't do too well against infra and red, nor against violet and ultra violet. However, some glasses cover a large spectrum. The balance of that is how little light from other colors gets through. When I wear my safety goggles, its like Cyclops (Xmen) Vision. I feel safe, but i can't see hardly anything. My pretty beams just become bland boring dots on whatever they are pointed at.
So first decide the laser you want. Green lasers are normally two different colors spliced together i think, It's been a long time since I studied this stuff, but green are more expensive because of the process used in making a green color. Blue lasers will cost about the same to double the price of your safety goggles, and I'm not familiar with recent prices, but you can expect to pay about 60 cents to a dollar per 10 miliwatts, and if its got some mondo DNA scraping bezelwork in a custom host, expect to pay triple.
