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Home / Bulbs and dimmers / E27 halogen bulb on a leading-edge dimmer glows when switched off

E27 halogen bulb on a leading-edge dimmer glows when switched off

A glow when switched off comes from one of three causes: a small current the dimmer lets through when off (common with electronic dimmers), voltage induced from nearby cables, or a fault such as the switch cutting the neutral instead of the live. A filament needs far more current than an LED to glow, so with filament bulbs a fault is the likelier cause — have it checked. There's no standard minimum load: use the minimum and maximum printed on your dimmer — with 42 W E27 bulbs a 10 W minimum needs 1, a 40 W minimum 1. The bulb must be marked dimmable.

E27 · halogen · leading-edge · glows when switched off · change

A glow when switched off comes from one of three causes: a small current the dimmer lets through when off (common with electronic dimmers), voltage induced from nearby cables, or a fault such as the switch cutting the neutral instead of the live. A filament needs far more current than an LED to glow, so with filament bulbs a fault is the likelier cause — have it checked.

Lights for this

50 lights
Jensen Wall Sconce
Jensen Wall Sconce
Jensen Wall Sconce

Jensen Wall Sconce

from £115
E27 · dimmable as stated by the supplier
Arrives 14–24 Oct
The first 50 are shown, best fit first
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The numbers for this situation

  • Typical bulb42 Whalogen E27
  • Bulbs for a 10 W printed minimum1the minimum printed on your dimmer decides
  • Bulbs for a 40 W printed minimum1
  • Our E27 lights stated dimmable130
  • Share of our E27 lights stated dimmable3 %

Worked out, not measured

Where these numbers come from

  • Bulbs needed = the minimum printed on the dimmer ÷ the bulb's watts, rounded up; typical bulb wattages are assumptions. Checked against 424 matching lights in our catalogue snapshot of 2026-09-27; 130 can be bought now. Same sums on every page, release families-2026-09-29.

All the numbers

Minimum printed on the dimmer (W)Bulbs neededLoad (W)
0142
10142
20142
40142

Related

E27 · halogen · trailing-edge · glows when switched offE27 · halogen · leading-edge · flickersE27 · halogen · leading-edge · buzzesE27 · halogen · leading-edge · won't dim smoothly