Osram Halogen Lamp Decostar 51S 12V 20W 36° GU 5.3

An Osram Decostar 51S dichroic MR16 halogen lamp, 12V, 20W, GU5.3 base, 36° flood, sold in a pack of 10 — a "cool beam" lamp for jewellery cases, art displays, and other heat-sensitive display lighting, or for stocking multiple fittings at once.

Will this fit my fixture?

If your existing bulb is a 12V GU5.3 MR16 halogen reflector, this is a direct twist-lock swap once power is off. Confirm your fitting runs on a 12V transformer, not 230V mains.

Key Features

• Dichroic coating reflects heat rearward, away from the lit object
• GU5.3 twist-lock base, 12V low voltage, 36° flood beam
• Pack of 10 — convenient for multi-fitting installations or stocking spares

Technical Specifications

Applications

• Museum and gallery accent lighting
• Jewellery and retail display cases
• Multi-fitting track lighting installations

FAQ

• Will this fit my fixture?
  Only if your fixture is 12V low-voltage with a compatible transformer and takes a GU5.3 MR16 reflector.
• Why buy a pack of 10 instead of a single lamp?
  It's a practical choice for fitting out multiple track or downlight positions at once, or for keeping spares on hand since halogen lamps have a limited rated life.
• What does "dichroic" mean?
  The coating reflects most of the lamp's heat backward instead of forward, keeping the light beam itself cooler — useful for close-up display lighting.
• Do I need a transformer?
  Yes — this is a 12V bulb and requires a 12V transformer.