Lasers measure light at frequencies based on wavelengths called nanometers (nm). In the visible spectrum, 532nm green is the brightest laser color at the same output power. This means that a 100mW laser from a green laser designator will be 7-10 times brighter than a 100mW laser from another laser color, including red, blue, purple and yellow. At the same power output, the green laser pointer is always brightest, meaning that the 100mW green laser designator is more than 7 times brighter than the 100mW laser of other colors. Now, that doesn't mean that colors like blue, red, purple, or yellow are impractical for astronomical purposes, because they're also fully utilized. Lasers emitting visible radiation in the wavelength range of 400 nm to 700 nm, in which eye protection is usually provided by defensive reflections including eyelid reflection (eye-closing reflection). This response provides protection under reasonably predictable conditions of use, including the use of optical instruments for beam vision.
You only want to think about getting the same brightness for non-green high powered laser, you need to buy a more powerful pointer laser with a higher power output. Any other color at 100mW is still very bright (definitely for night use) and even comes with some sculpting features. If you are using a laser pointer, be sure to: check the type of pointer you have; Select class 1 or class 2 Pointers (power less than 1 mW); Read manufacturer's instructions correctly and strictly follow them; Choose a pointer that only works when you apply finger pressure; Do not point the laser beam at any person or vehicle; Never stare at a laser pointer beam; Do not point the laser pointer beam at a mirror or any other reflective surface, except as specified in the authorized research agreement.