Zilla Incandescent Bulb, Day Blue Light and Heat, 150 Watt (3 Pack) Pack of Three Zilla Incandescent Bulbs, Day Blue Light & Heat, 150 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 Heavy-duty filaments yield hours of performance Simulates the daylight sun which is necessary for reptiles to regulate their body temperature