Sylvania RefLED Superia Retro MR16 GU5.3 5W Dimmable 12V – Replaces 40W

Dimmable — what does this mean in practice?

This lamp is designed to work with dimmers — you can adjust the light level steplessly between minimum and maximum brightness. Important notes:

• An LED-compatible dimmer circuit is required — old halogen dimmers may not work reliably with this lamp
• Dimming may cause slight flickering or stuttering at low power levels — this is a common phenomenon in LED dimming
• The minimum power threshold is typically around 10–15% — below this, the lamp may turn off completely
• Check compatibility — Sylvania maintains a list of approved dimmers; contact our customer service if in doubt

Compatible dimmers can be found in the Electrical Supplies → Dimmers category.

Typical applications for dimmed lamps

• Restaurants and hotels — dimmer lighting during the evening, brighter during the day
• Households — ambient lighting for living rooms and bedrooms
• Meeting rooms — light adjustment during presentations and video conferences
• Shops and gallery display areas — highlighting different product categories
• Home theaters and entertainment areas — light level during movies and video games

Superia MR16 DIM series — when to choose 5W vs 6.1W?

Sylvania offers two power ratings in the Superia MR16 DIM series:

• This 5W DIM (460/480 lm): replaces a 40W halogen — general lighting, ambient lighting, slightly softer light
• 6.1W DIM (621 lm): replaces a 50W halogen — more powerful spotlighting

Measure the wattage of your old halogen lamp — choose the correct model based on that. If the old lamp was 35–40W, choose this 5W model.

Dimmable vs non-dimmable — only a €0.10 price difference

Sylvania has priced this dimmable model exceptionally close to the non-dimmable version:

• 4.6W non-dimmable: €7.95
• This 5W dimmable: €8.05 (+€0.10)

In practice, you get dimming capability almost for free. This is exceptional — the standard price difference for dimmability is +€1–2. We recommend choosing the dimmable model if there is even a chance that you might want to add a dimmer in the future.

4 color temperature variants — for all purposes

• 2700K (extra-warm, like incandescent bulb): households, restaurants, hotels, vintage fixtures
• 3000K (warm white): the most common for ambient lighting
• 4000K (cool white): offices, meeting rooms, shops
• 6500K (daylight): museums, gallery staff rooms, areas requiring precise work

MR16 size with 44 mm diameter

This lamp is a compact MR16 version — slightly smaller (44 mm) than standard MR16 (51 mm), but maintains MR16 compatibility with its GU5.3 base.

Requires a 12V transformer

This is a 12V low-voltage lamp that requires a 12V transformer to operate. Works with both magnetic and electronic transformers, but compatibility with electronic transformers depends on the exact transformer model. Common compatible brands are Helvar, Tridonic, Osram, Ledvance, and Vossloh-Schwabe.

Transformer and dimmer — both must be LED-compatible

In a dimmable system, both components must be LED-compatible:

• Transformer: 12V LED-compatible (magnetic or electronic)
• Dimmer: LED-compatible — old halogen dimmers may not work

Compatible transformers can be found in the Electrical Supplies → Transformers and dimmers in the Electrical Supplies → Dimmers category.

Check the transformer power

The transformer power must correspond to the lamp. For a single 5W lamp, the transformer should be at least about 7W (reserve a small margin). For multiple lamps:

• 5 lamps = 25W → transformer at least 30W
• 10 lamps = 50W → transformer at least 60W
• 20 lamps = 100W → transformer at least 120W

Glass body — premium quality

The all-glass body produces more even light distribution than plastic, does not yellow over time, and provides a halogen-like appearance — fitting seamlessly into traditional light fixtures.

Replaces 40W GU5.3 halogen — 88% energy savings

This 5W LED produces the same light output (460–480 lm) as a traditional 40W GU5.3 halogen. Energy savings are approximately 88%, and the lifespan is 6–12 times longer.

36° beam angle — wide spotlight

Flood-class spotlight, suitable for general lighting, ambient lighting, and spotlights.

Installation checklist

1. Check that the fixture has a GU5.3 base (not GU4 or GU10)
2. Check that a 12V transformer is in use (magnetic or electronic)
3. Check that the transformer power is sufficient for the total power of the lamps
4. Check that the dimmer is LED-compatible (if in use)
5. Check that the fixture dimensions (44 mm diameter, 50 mm length) fit
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
8. Test the dimming function at different levels — check that the lamp does not flicker annoyingly

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