Osram Decostar 51S GU5.3 35W 12V 2900K 36° – dichroic reflector, dimmable
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The Osram Decostar 51S is a premium-level MR16 halogen spotlight with a dichroic reflector that reduces heat in the light beam by up to 66%. Warm white 2900K light, perfect color rendering (CRI Ra 100), and a 36° beam angle — the ideal choice for accent lighting, illuminating display cases, and spotlighting artwork. The UV filter protects colors from fading.
Requires a 12V transformer. GU5.3 base. Dimmable.
⚠ Made-to-order product
This product is made-to-order — delivery time is approximately 1–1½ weeks from the order date. Please take this into account if you need the lamp quickly. NOTE: minimum order quantity 5 pcs.
Technical specifications
- Lamp type: MR16 halogen spotlight, dichroic reflector
- Series: Osram Decostar 51S
- Base: GU5.3 (two-pin, low voltage)
- Voltage: 12 V (requires transformer)
- Power: 35 W
- Beam angle: 36° (spotlight)
- Color temperature: 2900 K (warm white, incandescent-like tone)
- Color Rendering Index (CRI): Ra 100 (perfect)
- Lifespan: 4,000 hours
- Dimmable: Yes, 100%
- Special features: Dichroic reflector (−66% heat in the beam), UV filter
- Approved for open fixtures (IEC 60598-1)
- Lamp construction: Decorative protective glass, contains no mercury
- Diameter: 51 mm
- Length: 46 mm
- Product code: HC501203536/02
NOTE: MINIMUM ORDER QUANTITY 5 PCS
Compatibility and installation
Requires a 12V transformer
This is a 12V low-voltage lamp that requires a 12V transformer to operate. The transformer converts the household 230V mains voltage to 12V. You can find compatible transformers (both electronic and magnetic) in our selection under the Electrical accessories → Transformers category.
Check the transformer wattage
The transformer's power must match the lamp (or the total power of multiple lamps). E.g., for one 35W lamp, the transformer must be at least 35W. For multiple lamps, add up the total power and choose a transformer accordingly — it is often advisable to leave a small margin (e.g., two 35W lamps = 70W, choose an 80–105W transformer).
GU5.3 base — two-pin attachment
GU5.3 is a base with two pins (Ø 5.3 mm) that is pushed directly into the fixture socket. Not to be confused with the GU10 base, which is a bayonet-style mount that operates on 230V mains voltage.
Dichroic reflector — cooler beam
The Decostar 51S's dichroic reflector reflects visible light forward while allowing infrared heat to pass through the back of the reflector. This means that the surface being illuminated feels up to 66% less heat compared to a standard halogen lamp. Especially useful in display cases, museums, art lighting, and food displays where heat can damage the object.
Note: the back of the lamp still gets hot — ensure that the fixture is designed to dissipate heat from the rear.
UV filter — protects colors
The UV filter blocks UV radiation that would otherwise fade colors in artwork, textiles, and products. This makes the Decostar 51S an ideal choice for museums, galleries, clothing stores, and display cases.
The lamp is dimmable
This Decostar 51S is 100% dimmable with compatible dimmers. Halogen lamp dimming works with both electronic and triac dimmers. Check that your transformer is dimmable if you wish to adjust the light output.
Installation checklist
- Check that the fixture has a GU5.3 base (not GU10)
- Check that you are using a 12V transformer with enough power for the total wattage of the lamps
- Check that the lamp dimensions (Ø51 × 46 mm) fit the fixture
- Turn off the power before installation — do not touch the lamp glass with your fingers (oils can shorten the lifespan)
- Install the lamp and switch on the power
Consider an LED option
If energy savings and longer lifespan are important, consider GU5.3 LED spotlights, which use approximately 80% less energy and last up to 25,000 hours. However, halogen retains its advantage with perfect CRI 100 color rendering, which is important for things like lighting artwork and jewelry.
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Delivery
We ship your order from our warehouse in Jyväskylä. Orders placed before 2 PM are usually shipped on the same day. Free delivery within Finland for orders over €150.
Warranty
Products purchased through Lumenled come with a manufacturer's warranty, supported by Lumenled in cooperation with the importer. You can find detailed warranty terms here: Warranty terms of our partners.