What Is Lumen Depreciation in LED Lighting and How Does It Work?
Switching to LED lighting is a smart long-term investment that can significantly reduce energy costs. However, to make the most of your LEDs, it's important to understand lumen depreciation-a key factor that affects performance over time.
While LEDs last much longer than traditional lighting options like fluorescents or metal halides, no bulb lasts forever. The main difference is that LEDs don't burn out suddenly. Instead, they gradually become less bright-a process known as lumen depreciation.
What Is Lumen Depreciation?
"Lumens" measure the brightness of a light. When you first install an LED, it emits its maximum "initial lumens." Over time, the amount of light it produces slowly decreases.
A simple way to track this decline is to compare current lumen output ("mean lumens") with the initial output. For example, if an LED is now emitting 80% of its original brightness, it's operating at 0.8 of its initial performance.
When Should You Replace an LED?
A widely accepted standard is to replace LEDs when their brightness falls to 70% of the initial output-a point referred to as L70. This represents the number of hours an LED can operate before it drops below 70% brightness.
Understanding lumen depreciation helps you better plan maintenance and replacements, ensuring your lighting remains efficient and effective throughout its lifespan.
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