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 considerations:

• An LED-compatible dimmer circuit is required — old halogen dimmers may not work reliably with this lamp
• Dimming may cause slight flicker or judder at low power levels — this is a common phenomenon in LED dimming
• The minimum power limit 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 you have doubts

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

Typical applications for dimmable lamps

• Restaurants and hotels — dimmer lighting during evening, brighter during the day
• Households — ambient lighting for living rooms and bedrooms
• Meeting rooms — light adjusted during presentations and video conferences
• Stores 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 wattages in the Superia MR16 DIM series:

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

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

Dimmable vs non-dimmable — only €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)

Practically, you get dimming capability with almost no extra cost. This is exceptional — the usual price difference for dimmability is +€1–2. We recommend choosing the dimmable model if there's even a chance you'll want to add a dimmer in the future.

4 color temperature variants — for all applications

• 2700K (extra warm, incandescent-like): households, restaurants, hotels, vintage luminaires
• 3000K (warm white): most common for ambient lighting
• 4000K (natural white): offices, meeting rooms, stores
• 6500K (daylight): museums, gallery staff areas, spaces 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 retains MR16 compatibility with its GU5.3 base.

Requires 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 model of the transformer. The most 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 category and dimmers in the Electrical Supplies → Dimmers category.

Check transformer power

The transformer's power must match the lamp. For one 5W lamp, the transformer should be at least about 7W (allow a small reserve). 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

A full glass body produces a more even light distribution than plastic, doesn't yellow over time, and gives a halogen-like appearance — fitting seamlessly into traditional luminaires.

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

This 5W LED produces the same light output (460–480 lm) as a traditional 40W GU5.3 halogen. Energy saving is 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 accent lighting.

Installation checklist

1. Check that the luminaire has a GU5.3 base (not GU4 or GU10)
2. Check that a 12V transformer is used (magnetic or electronic)
3. Check that the transformer's 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 luminaire's dimensions (44 mm diameter, 50 mm length) fit
6. Turn off power before installation — do not touch the lamp glass with your fingers
7. Install the lamp in place and turn on the power
8. Test the dimming function at different levels — check that the lamp does not flicker disturbingly

Also explore our selection of other GU5.3 LED spotlights and dimmers.