Question 1

What is the longitudinal uniformity of road surface luminance in EN13201?

Accepted Answer

In EN13201, there are many indicators used to evaluate lighting effects, such as Lav, Uo, UI, Ti, Rei, etc. Among them, the longitudinal uniformity of road brightness (UI) refers to the ratio of the minimum luminance to the maximum luminance along the longitudinal center line of the road, that is, UI=Lmin/Lmax. Similarly, if the road is a two-lane road, the smaller value of the brightness ratio of the longitudinal center lines of the two lanes is taken as the final result.

Question 2

What’s the utilization factor in street lighting?

Accepted Answer

The utilization factor road lighting is defined as the ratio of the luminous flux received by one or more parallel strips along the road to the sum of the individual total fluxes of the lamps / light sources of the installation. In the photometric test report of the lamp, there is a coefficient of utilization curve of the tested street light. It calculates the proportion of the luminous flux of the lamp on the house side and the street side at different tilt angles. Usually, the proportion of the luminous flux on the street side can reach about 70%. If the light distribution design with less backlight is used, this proportion can reach 80% or even higher.

Question 3

Will the light uniformity decrease when the go with timer dimming for street light?

Accepted Answer

No, it will not change. As you know, Uo=Lmin/Lave, and UI=Lmin/Lmax. When dimming technology is used to reduce the light output of the street lights, it does not change the light distribution of the lamp, so Lmin, Lave and Lmax will be reduced in a corresponding proportion, which will not affect the change of lighting uniformity. It is worth noting that for glare control, Ti will be reduced after using time-sharing dimming, but the reduction is not much.

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LED Street Light

Solar Street Light

Led Flood Light

Solar Flood Light

LED High Bay Light

High Mast Light

LED Traffic Light

LED Tunnel Light

LED Garden Light

LED Canopy Light

Led Bollard Light

Lighting Accessories

Smart Systems

Simulation Design

Smart Financing