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Why does my LED bulb flicker with an old dimmer switch?

There's no standard minimum load: use the minimum and maximum printed on your dimmer — with 8 W LEDs a 10 W minimum needs two bulbs, a 40 W minimum five, and some LED dimmers go down to 0 W. The bulbs must be marked dimmable, and the dimmer type (leading or trailing edge) should be the one the bulb maker lists.

There's no standard minimum load: use the minimum and maximum printed on your dimmer — with 8 W LEDs a 10 W minimum needs two bulbs, a 40 W minimum five, and some LED dimmers go down to 0 W. The bulbs must be marked dimmable, and the dimmer type (leading or trailing edge) should be the one the bulb maker lists.

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The numbers for this situation

  • Bulbs of 8 W for a 10 W printed minimum2
  • Bulbs of 8 W for a 40 W printed minimum5
  • Our E27 lights stated dimmable130

Worked out, not measured

Where these numbers come from

  • Verbatim question from the buyer bank (-1_people-deadends §3); answer computed. 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

MeasureValue
Bulbs of 8 W for a 10 W printed minimum2
Bulbs of 8 W for a 40 W printed minimum5
Our E27 lights stated dimmable130

People also ask

Why does my LED bulb flicker with an old dimmer switch?

There's no standard minimum load: use the minimum and maximum printed on your dimmer — with 8 W LEDs a 10 W minimum needs two bulbs, a 40 W minimum five, and some LED dimmers go down to 0 W. The bulbs must be marked dimmable, and the dimmer type (leading or trailing edge) should be the one the bulb maker lists.