Question 1

What are the four factors regarding MF in lighting?

Accepted Answer

Lamp Lumen Maintenance Factor LLMF, which describes the reduction in luminous flux of a light source over the duration of use.

Luminaire Life Factor LSF, which describes the failure of a light source or power supply over the duration of use.

Luminaire maintenance factor LMF, which describes the effect of fouling of the luminaire optics between cleaning processes.

The room surface maintenance factor RSMF, which describes the deterioration of the utilization factor due to the reduction of the reflectance value of the room boundary surface.

Question 2

What is maintenance factor in DIALux?

Accepted Answer

The maintenance factor in the lighting simulation is the product of the room surface maintenance factor and the lamp maintenance factor, the lamp lumen maintenance factor and the lamp survival factor, that is, MF = RSMF * LMF * LLMF * LSF. Approximate values over time can be, outdoors, the maintenance factor of lights is 0.9 (sports court), 0.8 (road) or 0.7; indoors, a very clean room, is 0.9, and a too dirty environment, is 0.8 or lower. If you need accurate values, you need to know the exact values of these 4 factors.

Question 3

What is difference between LLF and maintenance factor?

Accepted Answer

LLF is short for light loss factor, which is the loss of all light output after a certain time. Combined with the previous concept of maintenance factor, we can know that they are two identical concepts, which are now generally called maintenance factor. The cost of equipment maintenance and repair is greatly affected by this factor, so in order to reduce the overall equipment maintenance and repair costs, we need to pay attention to this factor.

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LED High Bay Light

High Mast Light

LED Traffic Light

LED Tunnel Light

LED Garden Light

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Lighting Accessories

Smart Systems

Simulation Design

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