Mega-Ray Mercury Vapor Bulb – 100 Watts (120V)

The Mega-Ray Mercury Vapor Bulb, 100 Watts (120V), is a type of light bulb commonly used in reptile enclosures to provide both heat and UVB rays. These bulbs are particularly popular among reptile owners because they offer a combination of heat and ultraviolet light, which is essential for the health and well-being of many reptile species.

Mega-Ray Mercury Vapor Bulb

Key Features:

  1. UVB Output: These bulbs emit UVB rays, which are crucial for reptiles to synthesize vitamin D3, aiding in calcium absorption and preventing metabolic bone disease.
  2. Heat Production: In addition to UVB, the bulb produces significant heat, helping to maintain the appropriate temperature gradient within the enclosure.
  3. Full-Spectrum Lighting: Provides full-spectrum light, simulating natural sunlight, which can enhance the coloration and overall health of reptiles.
  4. Durability: Known for their long lifespan and durability compared to other types of UVB bulbs.

Usage Tips:

  1. Distance: Ensure the bulb is placed at the recommended distance from the reptile to prevent burns and provide adequate UVB exposure.
  2. Mounting: Use a suitable fixture that can handle the wattage and heat output of the bulb.
  3. Monitoring: Regularly monitor the temperature within the enclosure to maintain the optimal environment for your reptile.
  4. Replacement: Even though these bulbs are long-lasting, UVB output diminishes over time. Replace the bulb according to the manufacturer’s guidelines, usually every 6-12 months.

Safety Considerations:

  • Fixture Compatibility: Ensure that the fixture used can handle the 100 watts of power.
  • Ventilation: Ensure proper ventilation to avoid overheating and potential fire hazards.
  • Protective Covering: Use a protective screen to prevent direct contact between the reptile and the bulb.

Common Applications:

  • Reptile Enclosures: Ideal for reptiles that require both UVB light and heat, such as bearded dragons, iguanas, and tortoises.
  • Indoor Terrariums: Used to simulate natural sunlight for indoor habitats.


The Mega-Ray Mercury Vapor Bulb is a reliable choice for reptile owners seeking a combined heat and UVB light source. Proper usage and regular monitoring are essential to ensure the health and safety of your reptiles.

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