Zilla Incandescent Bulb, Day Blue Light and Heat, 50 Watt (3 Pack) Pack of Three Zilla Incandescent Bulb, Day Blue Light & Heat, 50 Watt Provides necessary daylight that is less intense than bright white Blue light hue brings out colors and gives a unique appearance versus white light Simulates the daylight sun which is necessary for reptiles to regulate their body temperature Heavy-duty filaments yield hours of performance