Laser pointers of various wavelengths

Looking at the projector market, we can see that its light sources are divided into three categories, namely light bulbs, LED light sources and green laser light sources. So what is the difference between these three types of light sources? You need 500 megawatts or more for maximum combustion. The higher the power, the better the distance and burning effect. For other applications, like presentations, you can go for something with lower power, since you will no doubt be using the laser on a blackboard or whiteboard projection screen, so you can be lighter. No matter where you're directly facing the sun, if you're not sure, it's wiser to use high power than low power. According to the principle of high power laser pointer, under the condition of the same power, a laser pointer with a shorter wavelength emits brighter light than a laser pointer with a longer wavelength. However, light at the 532nm wavelength is more easily absorbed and more sensitive, and the light emitted by the 405nm blue-violet laser is much weaker to the human eye. On the other hand, high-power laser pointers have high requirements on batteries, so you may need to buy a better battery when buying a laser pointer, so that you can feel the 50000mw laser pointer better.