Wondering how long do LED lights last? Enter your LED rated lifespan, daily usage, and ambient temperature to estimate real-world lifespan in years. Compare against incandescent, halogen, and CFL bulbs, and see your 10-year replacement cost savings.
Quick answer: A standard 25,000-hour LED used 6 hours a day lasts about 11 years; premium 50,000-hour LEDs reach 22+ years. Real lifespan depends on junction temperature and drive current — high-bay LEDs rated 50,000 hours at 25°C typically deliver 35,000-50,000 hours in 35-40°C warehouse ambients. L70 marks the point where output drops to 70% of initial brightness.
Adjust the inputs below. Results update in real time. No sign-up required. Temperature derating uses the Arrhenius equation.
Enter your LED rated lifespan and usage conditions.
Check the L70 rating on the LED packaging or datasheet.
Hours per day the LED is switched on (e.g. living room 5h, office 10h, warehouse 16h).
How many days per week the light operates.
Higher ambient temperature reduces LED lifespan per the Arrhenius equation.
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See how LED rated lifespan compares to incandescent, halogen, and CFL bulbs. The bar chart scales to your selected LED rating.
LEDs last 25x longer than incandescent bulbs, 12.5x longer than halogen, and 3.1x longer than CFL. For a full cost-of-ownership analysis including energy savings, use our LED ROI Calculator.
Based on your usage pattern, see how many bulbs and how much money you would spend over 10 years with each technology. LED lifespan is temperature-adjusted.
| Bulb Type | Lifespan | Unit Price | Bulbs Needed (10 yr) | Total Cost (10 yr) |
|---|---|---|---|---|
|
LED (adjusted)
|
— h | $8.00 | — | $0.00 |
|
CFL
|
8,000 h | $4.00 | — | $0.00 |
|
Halogen
|
2,000 h | $3.00 | — | $0.00 |
|
Incandescent
|
1,000 h | $1.50 | — | $0.00 |
Over 10 years, switching to LED saves you $0.00 compared to incandescent, $0.00 vs CFL, and $0.00 vs halogen. On replacement bulbs alone, before energy savings. To include electricity costs, visit our ROI Calculator.
Temperature is the single most critical factor for LED longevity. The Arrhenius equation governs the relationship between heat and degradation rate.
The Arrhenius equation describes how the rate of a chemical reaction (in this case, LED semiconductor degradation) increases with temperature. For LEDs, the rule of thumb derived from this equation is:
This means a 50,000-hour LED running at 35°C will last only about 25,000 hours. At 45°C, it drops to roughly 12,500 hours. This is why thermal management (heat sinks, airflow, proper fixture design) determines whether LEDs reach their rated lifespans in real-world conditions.
Ideal operating range. Living rooms, offices, and retail spaces with air conditioning.
Kitchens, manufacturing floors, and enclosed fixtures without ventilation. Adequate heat sinking required.
Street lights, parking lots, and facade lighting in warm climates. Aluminum housing and thermal pads required.
Industrial high-bay, foundries, and tropical outdoor environments. Active cooling or derated specifications needed.
Need help selecting the right color temperature for your space? Use our Color Temperature Selector. For room-level lumen requirements, visit the Room Lumens Calculator.
This calculator estimates the L70 lifetime of LED fixtures using the TM-21 exponential decay model, based on IES LM-80 test data and adjusted for actual operating conditions including junction temperature and drive current.
L70 = L0 × exp(−α × t)
Where t is the operating time in hours, L0 is the initial lumen output, and α is the decay constant derived from LM-80 testing at the rated junction temperature.
The actual junction temperature differs from the LM-80 test condition. This calculator applies the Arrhenius equation to adjust the decay rate:
α_actual = α_rated × exp(Ea / k × (1/T_actual − 1/T_rated))
Higher drive current increases junction temperature and accelerates lumen depreciation. The calculator applies a derating factor based on the ratio of actual to rated current:
L70_adjusted = L70_rated × (I_rated / I_actual)^n
Where n is typically 1.5-2.0 for most LED packages. Operating below rated current extends life significantly.
This calculator follows IES TM-21-19 (Projecting Long-Term Lumen Maintenance of LED Light Sources) and uses IES LM-80-20 test data (Approved Method: Measuring Maintenance of LED Packages). L70 is the industry-standard threshold where output drops to 70% of initial lumens.
LED lights typically last 25,000 to 50,000 hours. At 3 to 6 hours of daily use, that translates to approximately 15 to 25 years of service. Premium industrial LEDs are rated up to 60,000 hours. Unlike incandescent bulbs (1,000 hours) or CFLs (8,000 hours), LEDs do not burn out suddenly but gradually dim over time. Use the calculator above to estimate the exact lifespan for your specific usage pattern.
No, LED lights do not burn out suddenly. LEDs follow the L70 lumen maintenance standard, meaning at their rated lifespan they still produce 70% of their original brightness. The LED continues to function beyond this point but at reduced output. Sudden failure is usually caused by a defective driver or power supply, not the LED chip itself. Quality LED fixtures with solid thermal management can operate well beyond their L70 rating. So when people ask "can LED lights burn out?" The answer is rarely from the LED itself, but rather from driver or electrical failures.
The main factors that reduce LED lifespan are: (1) High ambient temperature, which accelerates junction degradation. Every 10°C above 25°C roughly halves the lifespan; (2) Voltage fluctuations and power surges that stress the LED driver; (3) Frequent on/off cycling that causes thermal shock to the semiconductor junction; (4) Poor thermal management with inadequate heat sinks or enclosed fixtures that trap heat; and (5) Humidity and moisture ingress in non-IP-rated fixtures. Proper driver selection, adequate heat dissipation, and surge protection can extend LED life by 30 to 50%. For more tips, see our LED Lighting Buying Guide.
Temperature is the single most critical factor for LED longevity. Based on the Arrhenius equation, every 10°C above 25°C approximately halves the LED lifespan. For example, a 50,000-hour LED operating at 35°C will last about 25,000 hours, and at 45°C only about 12,500 hours. This is why proper heat sinking and thermal management directly affects LED fixture longevity, especially in outdoor and high-bay applications. Our calculator applies the Arrhenius derating factor automatically based on your selected ambient temperature range.
Yes, if your daily usage exceeds 8 hours per day. A 50,000-hour LED used 12 hours daily lasts about 11 years versus 5.7 years for a 25,000-hour LED. The payback for the price premium is typically within 2 years due to avoided replacement labor and bulb costs. For low-usage areas like closets or storage rooms (under 2 hours daily), a 25,000-hour LED is more cost-effective. To quantify the exact savings for your scenario, including energy costs, use our LED ROI Calculator.
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