What is Lumen Maintenance

Horace He

Last Updated: August 14, 2023

What is Lumen Maintenance

Lumen maintenance is the measurement of how well a lighting product retains its initial lumen output over time. It is a factor in evaluating the performance and longevity of light sources and luminaires. Lumen maintenance is typically expressed as a numerical value followed by the letter L or LM, which stands for lumen maintenance. This value represents the percentage of light output that remains after a certain number of hours of operation. Commonly used values include L50, L70, L80, and L90, or their LM equivalents.

For example, if a light source or luminaire is specified as L70 at 50,000 hours, it means that it will maintain 70% of its initial light output after 50,000 hours of use. This measurement provides an indication of how long the light source or luminaire will maintain a certain level of brightness before it starts to significantly degrade.

Lumen maintenance is an important consideration in lighting design and selection as it helps users understand how the brightness of a light source or luminaire will change over time. It allows for informed decisions about lighting needs and potential replacements. The nomenclature for lumen maintenance is evolving. The current practice of using L or LM values may not be sufficient for comparing products or determining their useful life. A new measure is emerging, which specifies lumen maintenance at a specific number of hours, such as 100,000 hours. This provides a more accurate representation of how well a light source or luminaire will maintain its brightness over a longer period.

Frequently Asked Questions

How Many Lumens Is Good for Eyes

Below 3500 lumens, our eyes experience a comfortable level of brightness. However, once the brightness of direct or reflected light exceeds 4000 lumens, the human eye begins to have difficulty receiving the light.

Is Higher Lumens Always Better

If you intend to use the device outdoors or in a room with significant ambient light, a high lumen count is crucial. This also applies to scenarios where you are utilizing a projector in a spacious area and/or need a larger screen size.

Is 1500 Lumens Too Much

If you are using candles as a light source, you will save a significant amount of money on electricity, but the amount of light emitted will be limited. For general lighting purposes, the U.S. Department of Energy recommends looking for light bulbs that have a brightness level ranging from 450 to 1,600 lumens.