The 50mw green is way more visible than the 250mw red but still, the red definitely has a visible beam at night but it's not nearly as visible as the green. If I were to compare the red to a green laser of similar power/visibility, it's similar to a 15-20mW green. Also, because of the power increase, the red burns a lot faster than the green. The beams appear more visible when your directly behind them (or when the camera is directly behind them, like in the pics).
If you're looking for visibility and brightness, get a green laser(or a really powerful red)