Raw Lumens vs. Effective Lumens

What Are Raw Lumens?

Raw lumens refer to the theoretical maximum light output of an LED. This is calculated by multiplying the rated lumen output per LED by the total number of LEDs in a light.

For example, if an LED light contains eight LEDs, each rated at 100 lumens, the raw lumen output would be: 8 LEDs x 100 lumens = 800 Raw Lumens

What Are Effective Lumens?

Effective lumens measure the actual output of light, taking into account real-world losses, which makes it a more accurate reflection of visible light. Losses in light output come from various factors such as heat, optical materials, and assembly, resulting in reduced effective lumens.

For instance: If a light has 800 raw lumens but loses 40% of its output due to real-world conditions, it will produce: 800 lumens – 40% losses = 480 Effective Lumens

Factors Affecting Effective Lumens

1. Thermal Losses
   LEDs become less efficient as they heat up, and prolonged use causes their output to decrease. Effective thermal management helps, but even with optimal cooling, LED lights can lose 10-20% of their rated output due to heat.
2. Optical Losses
   As light passes through lenses or covers, it loses intensity based on the material’s clarity. These optical materials can reduce the total light output by 10-20%, depending on their quality.
3. Assembly Losses
   Small variations during manufacturing and assembly, like slight misalignments or inconsistent materials, can impact overall performance. These losses further reduce effective lumens compared to raw lumens.

Key Difference: Raw vs. Effective Lumens

• Raw Lumens provide an estimate based on LED potential without factoring in real-world losses.
• Effective Lumens offer a realistic output measurement, accounting for heat, optics, and assembly.