Are LED signage loads constant voltage or constant current?

LED strips, modules and channel-letter sources are constant-voltage loads at 12V or 24V — the wrong type means dead or burned LEDs. Keep one voltage grade per run; mixing 12V and 24V supplies on one strip is the most avoidable mistake.

How much load should a signage power supply carry?

Run supplies at ≤80% of rating for lifespan and stability, and split large installations into zones with their own supply — one fault darkens one zone, not the whole sign.

LED Signage & Facade Lighting Power: 6-Pitfall Checklist

Q: Why do long LED strips dim at the end, and how do you fix it?

Voltage is lost in the wiring. Three fixes: feed in sections (return to the trunk every ~5 m), place supplies close to the load, or increase conductor size — fixing the layout beats buying better strips.

Six field-proven rules for constant-voltage power in signage and architectural lighting — from voltage drop to derating.

011 · Constant voltage vs constant current

LED strips, modules and channel-letter sources are constant-voltage loads at 12V or 24V — wrong type means dead or burned LEDs. Keep one voltage grade per run: mixing 12V and 24V supplies on one strip is the most avoidable mistake.

022 · Voltage drop — the only cause of dim tails

Long strips dim at the end because voltage is lost in the wiring. Three fixes: feed in sections (return to the trunk every ~5 m), place supplies close to the load, or increase conductor size. Fixing the layout beats buying better strips.

033 · 80% derating, zone-by-zone supply

Run supplies at ≤80% of rating for lifespan and stability. Split large installations into zones, each with its own supply — one fault darkens one zone, not the whole sign, and service doesn't black out the full facade.

044 · Match the supply form to the environment

Sealed light boxes need natural-convection designs — our SCMLH lightbox series works at −25~50°C by free convection, fanless and dust-safe. Rain-exposed headletters take our JHPS rainproof semi-potted line. Narrow coves take the slim QHLH profile. Never put an indoor supply inside a sealed box.

055 · Efficiency and input range

Efficiency drives box temperature and energy cost. Our CMLH GaN strip-supply line reaches 93–95% at 24V (91–93% at 12V) with 110–240V full-range input (verified datasheet figures) — one build serves domestic 220V and export 110/230V projects alike.

066 · MEAN WELL users: cross-reference first

If your BOM references LPV/LPF, PWM, NPF, HLG or ELG, use our application-level cross-reference to find the matching series — wattage, protection and dimming deltas are confirmed by engineering per inquiry. The table is a selection entry point, not a swap promise.

07Next step

Send "luminaire type + total power (or strip metres) + environment + quantity" — engineering replies within 24 hours with a zoned configuration.

Submit inquiry — answered within 24h

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