Equipment page · Venue pendant lighting

Bunk Leicester dimmable E27 lighting

Replacement Bell LED lamps illuminate normally but switch off before the control reaches its lowest setting. The Bell pack shown is dimmable; the behaviour points to a low-end compatibility, minimum-load or dimmer-trim issue rather than proof that the lamps are faulty.

Run controlled testQR label
Venue
Bunk Leicester
Location
Pendant fittings in customer area · exact circuit to confirm
Old lamp
Megaman LC7209.5-E27-2800K · SKU 142574
New lamp
Bell Lighting Genesis/Classic E27 · 8.1W · 810lm · 2700K · likely 60680
Dimmer
Make/model, type and rated load not yet recorded
Status
Open · usable above dropout point

Search this page

Find checks, parts or decisions

Issue brief · 2026-07-23

New LED lamps drop out at low brightness

OpenBell replacements turn off sooner than old Megaman lamps

Identity confirmed

  • Old: Megaman LC7209.5-E27-2800K / UK SKU 142574, 9.5W, E27, 2800K, 810lm, dimmable.
  • New pack: Bell 8.1W, E27/ES, 2700K, 810lm, 240V, dimmable symbol shown.
  • Bell sells visually similar dimmable and non-dimmable versions. The photographed dimmable specification most closely matches Genesis part 60680; confirm the barcode/end-flap code before reordering.

Diagnosis

  1. The Bell LED driver has a higher minimum conduction threshold than the Megaman.
  2. An older leading-edge dimmer or non-LED dimmer may not support the new lamps.
  3. Six Bell lamps total only 48.6W; fewer lamps draw even less and may fall below the dimmer's minimum load.
  4. An adjustable dimmer's low-end trim may be set below the Bell lamps' stable range.
  5. Mixed lamp types on one dimmer can create unstable or unequal dimming.

Current decision

The Bell lamps are not automatically “wrong”: they are sold as dimmable but only with a compatible LED dimmer. Switching off near the bottom is a recognised LED dropout symptom. First test one complete circuit with matching Bell lamps and record the dimmer details. If dropout remains, use a competent electrician to set the low-end trim or fit a compatible trailing-edge LED dimmer. If preserving the old range matters and stock is genuine, a like-for-like Megaman 142574 is the lowest-change lamp trial.

Safe controlled test

Separate lamp behaviour from dimmer/load failure

  1. Photograph the dimmer: front, make/model and any label—without removing it. Count every lamp controlled by it and record whether all switch off together.
  2. Isolate before lamp changes: switch off the circuit, allow lamps to cool and use only intact E27 lamps of the same model.
  3. Remove mixed types: on one test circuit fit all Bell dimmable lamps; do not mix Bell, Megaman and non-dimmable lamps.
  4. Start at full: switch on at maximum, then lower slowly. Mark the position where flicker begins and where all lamps extinguish. Repeat once while raising from minimum.
  5. Compare one known-good old lamp: if safe and available, restore the old Megaman arrangement and repeat. A much lower stable point confirms combination-specific compatibility, not necessarily a wiring fault.
  6. Check the load: number of Bell lamps × 8.1W. Compare that total with the dimmer's published LED minimum and maximum—not its incandescent rating.
  7. Electrician stage: ask a competent electrician to identify leading/trailing-edge type, check neutral/wiring, confirm LED load and set any manufacturer-provided minimum-brightness trim. Do not open the live control yourself.

Stop and isolate: burning smell, crackling, excessive heat, arcing, repeated breaker trips or erratic operation above normal brightness. A clean, repeatable switch-off only at the lowest setting is usually compatibility/dropout, but it should still be corrected if that low range is operationally required.

Record for diagnosis

Missing evidence

  • Exact room/pendant circuit
  • Dimmer make, model and front photo
  • Number of lamps on that control
  • Bell barcode/end-flap product code
  • Whether lamps flicker/buzz or simply turn off
  • Whether all extinguish together
  • Approximate knob/slider dropout position

Replacement routes

Use confirmed dimmable E27 lamps only

Prices and stock can change. Do not buy a full case until one lamp/circuit combination passes the low-end test.

LOWEST-CHANGE TEST · 142574

Megaman 9.5W E27 2800K dimmable

Exact old specification: 810lm, opal GLS and warmer 2800K. Best lamp trial if the existing dimmer must remain. Confirm genuine SKU 142574 and return terms because this is an older product.

Check supplier
BELL · LIKELY 60680

Bell Genesis 8.1W E27 2700K dimmable

This matches the photographed 8.1W/810lm/2700K dimmable format. Bell requires a compatible LED dimmer. Confirm code 60680 on the actual box; Bell's 60676 is the similar non-dimmable E27 version.

View specification
ALTERNATIVE · ILGLSE27DC084

Integral frosted GLS E27 2700K dimmable

806lm warm-white GLS alternative. Treat as a one-lamp compatibility trial; another “dimmable” brand is not guaranteed to solve an incompatible dimmer.

Official product
SYSTEM FIX

LED-compatible trailing-edge dimmer

If the Bell lamps are retained, the robust fix may be a dimmer selected from the lamp/dimmer compatibility data, with a suitable LED load range and adjustable low-end trim. Selection and fitting should be by a competent electrician after counting the circuit load.

Visual evidence

Lamps, packaging and venue fittings

Megaman LC7209.5 E27 2800K old lamp listing
Old Megaman model shown as LC7209.5-E27-2800K.
Bell Lighting Classic LED GLS six-pack front
New Bell pack: 8.1W, 810lm, 2700K, E27 and dimmer symbol.
Bell Lighting bulb pack electrical specifications
Bell pack side: 240V, 50Hz, 36mA, 60 × 105mm.
Pendant lighting at Bunk Leicester
Bunk Leicester pendant-lighting area; exact failed fitting/circuit still to be marked.

Copy/paste electrician handover

Low-end LED dimming dropout

Bunk Leicester — customer-area E27 pendant-lighting circuit, exact control/location and dimmer model not yet recorded. Logged 23 July 2026. Old lamps: Megaman LC7209.5-E27-2800K / SKU 142574, 9.5W, 810lm, dimmable. New photographed lamps: Bell Lighting E27 opal GLS, 8.1W, 810lm, 2700K, dimmable; likely Genesis 60680 but confirm code/barcode. New lamps work at normal/full brightness but switch off when dimmed lower than a certain point. Please identify dimmer make/model and leading/trailing-edge type; count lamps and calculate total LED load; check against LED min/max rating and Bell compatibility; confirm all lamps are identical and dimmable; check wiring/neutral condition; and set manufacturer-approved low-end trim if available. If incompatible, specify an LED trailing-edge dimmer with suitable load range rather than replacing lamps blindly.