How long do LED channel letters last?

The LEDs in a channel letter are usually rated for about 50,000 hours before their light drops to 70% of what it was new. At 12 hours a day, that is roughly 11 years. The power supply is the part most often replaced, and heat shortens the life of both. Our letters are 304 stainless steel and do not rust through, so the letter itself is rarely what wears out; the electronics inside can be replaced.

What “50,000 hours” means

LEDs do not usually burn out the way a bulb does. They fade slowly. Lighting makers measure that fade in the lab and project how long the light takes to fall to 70% of its starting level. That point is called L70. For LED modules, about 50,000 hours to L70 is the common rating; some are rated higher, some lower, so check the spec sheet of the modules in your sign.

After L70 the sign still lights. It is just dimmer, and the change happens so slowly that most people only notice it next to a new letter.

What the rating assumes

An L70 rating comes from lab testing at set temperatures and currents, then a projection. A module in a letter that bakes in afternoon sun runs hotter than one in a shaded or indoor letter, so real life can be shorter or longer than the number on the sheet. Treat the rating as a fair comparison between modules, not a countdown.

Hours per day vs years to L70

How many years 50,000 hours lasts depends on how long the sign is on:

Sign on per day	Hours per year	Years to 50,000 hours
8 hours	2,920	about 17
12 hours	4,380	about 11
18 hours	6,570	about 7.5
24 hours	8,760	about 5.7

A sign on a dusk-to-dawn photocell runs longer in winter and shorter in summer. A sign timer that turns it off after closing saves hours every night.

What wears out first

Part	How it ages	What you notice	Fix
Power supply	Its electronic parts dry out faster with heat and with hot-cold cycles	Flicker, dim sign, sign won’t come on	New outdoor power supply, fitted by an electrician
Connections and seals	Water gets past a cracked seal or a blocked drain hole and corrodes the joints	One letter or part of a letter goes out	Clean, remake and seal the joint
LED modules	Slow fade; the odd module fails	Dim patches, one dark spot	New LED modules
Acrylic faces and graphics	Sun fades colored vinyl and printed graphics; impacts crack faces	Faded color, cracks	Replacement acrylic face
Stainless steel letter	Does not rust through; surface can stain near salt	Dull or stained finish	Wash it

Sign technicians report that power supplies, not LEDs, make up most of their LED sign service calls. That matches what power supply makers say: the supply is the weakest link in an LED sign.

Signs that a sign is aging

• One letter, or one group of letters on the same power supply, is dimmer than the rest.
• The sign flickers or blinks.
• A replaced letter looks noticeably brighter or whiter than its neighbors.
• Colored faces look washed out in daylight.
• Corrosion shows at a wire entry or inside a letter you open for service.

None of these means the whole sign is finished. Each one points to a part you can replace.

Heat is what ages a sign

Most LED power supplies contain electrolytic capacitors, and their life depends heavily on temperature. A common rule of thumb in the lighting industry is that every 10 °C (18 °F) hotter roughly halves their life. LEDs also fade faster when they run hot.

That is why where the power supply goes matters as much as which one you buy:

• Keep the power supply in a dry, ventilated place, not sealed in a hot box in the sun or packed in insulation.
• Mount it on metal where possible, so it can shed heat.
• Do not load it to its limit. A supply run near its maximum runs hotter. Channel letter power supplies explains how much headroom to leave.
• The electrical code also requires the supply to stay reachable for service, which makes later replacement simple.

How to make your sign last longer

1. Cut the hours. A timer, a photocell, or both, keep the sign off when nobody is around. See photocells and sign timers.
2. Dim it at night. Many signs are brighter than they need to be after dark. An LED sign dimmer lowers the output, and less power means less heat. See dimming LED signs.
3. Keep water out. Keep drain holes open and wire-hole seals intact. Check both every spring and fall.
4. Keep it clean. Dirt on the faces makes a sign look dim long before the LEDs are. See maintenance and cleaning.
5. Fix problems early. A flickering supply or a corroded joint only gets worse.

Repair or replace?

Because the stainless letter body lasts, most aging signs need parts, not new letters: a power supply, a few modules or a face. Start with our sign repair page or browse repair parts. If the sign is dark today, see channel letters not lighting. If it is an older sign still lit with glass neon, LED vs neon signs explains how the letters can be relit with LEDs.