Red light is the slowest, biggest light wave in the visible spectrum. It just lazes around, bumping into things. Since it’s so slow, it’s perfect to make things just barely visible and not draw attention to itself, just like in every sci-fi movie. Yes, it means danger as in do not expect it to do much or be too active. Slovenly, actually. It excels at giving just enough light to recognize our prurient desires, lustfully illuminating (just) the deepest carnal desires we all carry around with us through our lives. It's a lazy, lumbering oaf, too, incapable or unwilling to carry much data. You'd be tired, too, if your wavelengths were as big as buildings.