What Is Lamp Lumen Depreciation?

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Author: Lisa
Published: 10 Dec 2021

An L70 Test and Report for the Life of an LED Lamp or Fuse

You can see a reference to L70 calculations in the chart above. You should be aware of the findings in the L70 report when you are considering buying anLED lamp or fixture. An L70 is a test and report that predicts the time it will take for the light to dim to 70% of its original output.

An L70 report that rates the high bay lamp or fixture at 50,000 hours is predicting that the product will maintain 70% of its original light output for at least 50,000 hours. The L70 rating is different from the expected life span of the lamp. The average operational life of the light source is determined by using the L70 and then using a test report which shows the life of the lamp or fixture.

The Life of the Best Light-Coloring Lamps

There is only one lighting solution that offers the best in retention over the years of use, and that is the one that is tallest above the rest. The best lamp models have the best retention of light. Over time, the depreciation of the light-colored substance is lower than other options such as metal halide, compact fluorescent, or incandescent.

Lumen Depreciation

The process by which the output of the source reduces over time is called lumen depreciation. The operating temperature of the source, the type of source used, and the hours of operation are some of the factors that affect lum depreciation. The lowest and highest lum depreciation is found on sources such as fluorescent andLED.

Measurement of the Age and Depreciation Rates for a Bulb

The total output of a fixture decreases as the fixture ages. The process of decreasing the output of a bulb is called lumen depreciation. The test conditions and methods are specified in the report. The data is collected for a minimum of 6,000 hours.

The Lighting Maintenance Factor

The reduction of light levels over time is called the lighting maintenance factor. The lighting levels at the end of life should be designed. The light's efficacy decreases over time.

Average Lifetime of Group Relamping Lamps

As a lamp ages and nears the end of its life, it produces less and less light on a predictable curve, the extent of which depends on the type of lamp. If group relamping is used as a planned maintenance strategy, the LLD factor should be taken at the point in time when the lamps are replaced. 40% of life is the average. The table below shows the typical values for lamps.

The Utilization Factor of Light Sources

The depreciation in light output for a specific light source is a factor used by lighting designers. Light sources depreciate at different rates. The utilization factor is the ratio of the time that equipment is in use to the total time that it could be used. The ratio is the amount of energy used divided by the maximum amount of energy that can be used.

The Light of a Miniature Lamp

The act or process of making something clearer or brighter is what an illumination is. An example of illumination is an explanation. A bright porch lamp is an example of an illumination.

It is either spiritual or intellectual enlightenment. The surface per unit area is the source of illumination. The unit is either lux or metre-candle.

The m2 has a light intensity per m2. Imagine a sphere of distance around a point. The light from all directions of a standard spermaceti candle is equivalent to one MSCP.

Projector Lamp Life

The projector lamp brightness decay curve is shown in the figure. If the lamp is being operated in full output mode, it will only produce 65% of the original brightness after 500 hours. 75% of original brightness can be achieved if the lamp is operated in eco mode.

The effectiveness of presentations made in partially lit rooms can be altered by projector lamp depreciation of 25% to 30%. After 500 hours or so, the original brightness of the lamp may have been insufficient to allow bright projected images in only partially darkened rooms, which may require fully darkened rooms to achieve that same clarity of image. The projector application's brightness decay will vary.

An Invention to Combine the Performance of Pulse Arc Lamp and 90 KHz Electronic Ballast

It would be desirable to combine the two efforts to compound the benefits of both efforts for greater improvements than either effort alone can provide, however, an impediment to combining the efforts has been that the available high frequencies were not designed to operate the pulse Arc lamps. In an embodiment of the invention. A high Frequency electronic ballast is used to start lamps.

The lamps are designed to operate at wattages of at least 400 watt. The combination of the two lamps with a modified 90 Khz electronic ballast provides the best performance in the industry. The present invention offers two advantages, one of which is the improved performance offered by a 90 kHz electronic ballast.

The effects of fill pressure in the arcs tube give the first advantage. The long mean free path of the gas in the arcs tube causes sputtering damage at startup. Standard 320volt ballasts will not start a lamp with fill pressures in excess of 33 torr.

The high fill pressure reduces sputtering damage, increasing the performance of the lamp, even though it requires starting voltages of at least 3,000 volts. Many modifications and changes will occur to those skilled in the art of the invention, which has been described by way of illustration. The claims are intended to cover all modifications and changes that fall within the true spirit and scope of the invention.

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