Exo Terra Halogen Basking Spot 100WThe Exo Terra Halogen Basking Spot 100W is a highly energy efficient broad-spectrum daylight bulb. It optimizes heat penetration through increased infrared levels and enriches colouration through Neodymium It also stimulates breeding behaviour and physiological well-being through UVA rays and can be combined with Night Heat Lamp or Infrared Basking Spot for a 24-hour cycle. Halogen bulbs are actually an advanced variation of incandescent bulb technology. One of the major factors that shorten an incandescent bulb's lifespan is the evaporation of the tungsten within the bulb. By adding a trace amount of a halogen gas (methyl bromide) inside the bulb, a chemical reaction removes the tungsten from the wall of the glass and deposits it back onto the filament, extending the life of the bulb. The higher temperatures of halogen lighting contribute to a whiter light, a higher light output and a greater efficiency.