Sylvania RefLED Retro MR11 GU5.3 4W 345lm 36° 12V – glass body, replaces 35W

MR11 size with GU5.3 base — a unique combination

Most GU5.3 base spotlights have the following dimensions:

• Standard MR16: 51 mm diameter, GU5.3 base — most common
• This Sylvania special model: 35 mm diameter (MR11 size), GU5.3 base — rarer
• Standard MR11: 35 mm diameter, GU4 base (4 mm pins) — different

This Sylvania model is suitable for luminaires where:

• There is a GU5.3 base but the lamp housing is smaller than 51 mm
• Specialty (e.g., US-imported) luminaires
• Vintage and retro luminaires where a small lamp size is part of the aesthetic
• Smaller spotlights and display cases

Check the lamp dimensions before ordering — measure the diameter of your existing halogen to ensure suitability.

Requires 12V transformer

This is a 12V low-voltage lamp that requires a 12V transformer to operate. This Sylvania model is compatible with both:

• Magnetic transformers (traditional, heavier) — common in older luminaires
• Electronic transformers — lightweight, more modern technology, in almost all new luminaires

Compatibility with electronic transformers depends on the exact transformer model — not all may work with this LED lamp. The most common compatible brands are Helvar, Tridonic, Osram, Ledvance, and Vossloh-Schwabe.

Compatible transformers can be found in the Electrical supplies → Transformers category.

Check transformer power

The transformer's power must match the lamp (or the combined power of multiple lamps). For one 4W lamp, the transformer should be at least about 5W (allow a small reserve). For multiple lamps:

• 2 lamps = 8W → transformer at least 10W
• 5 lamps = 20W → transformer at least 25W
• 10 lamps = 40W → transformer at least 50W

Glass body — premium quality

Unlike ordinary plastic LED lamps, this Sylvania RefLED Retro has a full glass body — the same material as traditional halogen lamps:

• More even light distribution than plastic
• No yellowing over time
• Halogen-like appearance — seamlessly fits into old luminaires
• Withstands higher temperatures than plastic

Replaces 35W GU5.3 halogen — 89% energy saving

This 4W LED produces the same light output as a traditional 35W GU5.3 halogen. Energy saving is about 89%, and the lifespan is:

• 35W GU5.3 halogen: 2,000–4,000 h
• This Sylvania RefLED Retro: 15,000 h — 4–7 times longer

Additionally, 50,000 switching cycles makes this an excellent option for luminaires that are switched on and off frequently (e.g., motion sensor lights, bathrooms, storage rooms).

This lamp is not dimmable

Do not install the lamp in a luminaire equipped with a dimmer. The lamp may flicker, stay on at full power, or be damaged.

36° beam angle — wide spotlight

The 36° beam angle of this lamp is flood class — a wide spotlight suitable for:

• General lighting in small spaces
• Mood lighting in hotels, restaurants, and bars
• Small spotlights and display case lights
• Chandeliers and multi-lamp luminaires where MR11 size fits

Installation checklist

1. Check that the luminaire has a GU5.3 base (not GU4 or GU10)
2. Measure the diameter of the lamp housing — 35 mm space is needed (not a larger MR16 space)
3. Check that a 12V transformer is in use (magnetic or electronic)
4. Check that the transformer's power is sufficient for the total power of the lamps
5. Check that the luminaire does not have a dimmer
6. Turn off the power before installation — do not touch the lamp glass with your fingers
7. Install the lamp and turn on the power

Also check out our selection of other GU5.3 LED spotlights.