R-Zilla - Night Spot Black 50W. Night Black Heat Incandescent Spot Bulbs. Emits a focused, 24-hour heat source ideal for reptile basking areas. Great for night-time viewing to observe natural nocturnal behaviors. Ideal for tropical and desert habitats; the bulb provides focused heat while the photons emitted by the filament never escape the dark tint. The spot bulb provides a focused beam of energy to heat the air inside the enclosure to create the warmth needed for a healthy reptile environment. The bulb is made from glass containing rare earth black phosphors, which simulates the moons natural glow for nocturnal viewing without disturbing the reptiles day/night cycle. Small Animal: Reptile Incandescent Bulbs Black 50 watt Boxed Ship Dim: 5.2x2.82.7 in Ship Wt: 0.1 lb