Gu and mr lamps are direct replacements for higher-watt halogen bulbs. Ideal for general and spot lighting, they are typically used in track and recessed lighting fixtures. They are also dimmable to suit any mood and are available in the versatile bright white color temperature (5000K). mr Luminus LED mr light bulbs are multifaceted reflector bulbs that produce a narrow so_ edged and precise beam of light. These bulbs have a 30° beam angle and can produce a bright white light (5000K). Luminus LED mr bulbs are typically used for architectural lighting applications and retail applications.