Tool
Halogen or incandescent → LED: keep the same brightness
Compare lumens, not watts. A 50 W halogen GU10 delivers about 450 lm; a well-specified 5 W LED reaches 400–500 lm at a fraction of the power. Beam angle changes the feel: 36° concentrates (kitchen), 110° spreads (hallway).
Equivalence calculator
Halogen → LED reference table
| Halogen (W) | ~ Lumens | LED target (lm) | GU10 | E27 |
|---|---|---|---|---|
| 20 W | 180 lm | 200 lm | 2–3 W LED | 2–3 W LED |
| 35 W | 300 lm | 350 lm | 3–4 W LED | 4 W LED |
| 50 W | 450 lm | 500 lm | 5 W LED | 5–6 W LED |
| 75 W | 650 lm | 750 lm | — (rare GU10) | 8–9 W LED |
| 100 W | 1300 lm | 1520 lm | — | 12–15 W LED |
Examples: Check price on Amazon UK Check price on Amazon UK
Listing data from manufacturer/Amazon pages checked 23 October 2026. Prices change — verify before buying. As an Amazon Associate I earn from qualifying purchases.
Install: replace GU10/MR16, bases. Full interactive version also on French tools page.