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Well 532nm is the brightest common wavelength you can get, and also the one that is easiest to obtain in higher powers. Sure the 445nm lasers are available, but they're more expensive and not as mass produced as 532nm lasers. The red lasers are also not that bright to the eyes and wouldn't affect night vision as much as green.
445nm is easiest to obtain in higher powers :beer:
For the price of a 2W 445nm, you can only get about 500mW of 532nm.