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Guide · Lamps and dimming

What LED lamp to use with a lighting control system?

The most common problem with mains dimmable (phase or triac) lighting control is the wrong lamp. Here, lamps includes LED strip as well as bulbs.

Leading edge or trailing edge

The lamp has to suit the way the control system dims: leading edge (also called forward phase) or trailing edge (reverse phase).

Leading edge Switches on part-way through each half-cycle, cutting its start.
Trailing edge Switches off part-way through each half-cycle, cutting its end.

Some control systems are phase adaptive: they adjust themselves to leading or trailing edge lamps. Some lamps are dual-compatible and work with either.

Before you choose lamps

  • Match the dimming type

    Use lamps made for your system’s dimming type, or dual-compatible lamps.

  • One lamp per circuit

    Don’t mix lamps on a circuit, such as GU10s with LED strip, or two models of GU10. It can cause dimming problems even when every lamp is the same dimming type.

  • Test before installing

    Try your chosen lamps on the system first, so you can satisfy yourself of the dimming.

We’d avoid

  • Cheaper electrical wholesaler brands
  • Lamps bought on Amazon or eBay

We recommend these dual-compatible ranges