Street roadway lighting is considered an important safety for busy streets and highways, where visibility is essential. Proper lighting can be expected to reduce night crashes by approximately 30%, thereby improving safety for drivers, riders, and pedestrians.
Conventional road lighting luminaires can be divided into three types according to the light distribution: Cut-off, semi-cut-off, and Non-cut-off.
Today we will share what is the difference between different types of cut-off luminaires.
1. The Optical distribution Cut-off curve luminaire
The angle between the maximum light intensity direction of the lamp and the downward vertical axis of the lamp is between 0° and 65° and the maximum allowable value of the light intensity in the 90° angle and 80° angle direction is 10cd/1000lm and 30cd/1000lm respectively, Regardless of the size of the luminous flux of the light source, the maximum light intensity in the 90° angle direction does not exceed 1000cd.
Advantage: Cut off luminaire with the best glare control, as the lateral extension of light is controlled, resulting in darkening of the area around the road. Glare is barely perceptible and at the same time, high road surface and brightness uniformity can be achieved. Suitable for main roads, expressways.
Reference light distribution of Cut-off luminaire;
Product link:
2. Semi Cut-off Luminaire
The angle between the direction of the maximum light intensity of the lamp and the downward vertical axis of the lamp is between 0° and 75° and the maximum allowable value of the light intensity in the direction of 90° and 80° is 50cd/1000lm and 100cd/1000lm respectively, Regardless of the size of the luminous flux of the light source, the maximum light intensity in the 90° angle direction does not exceed 1000cd.
The Semi-cut-off luminaire with a little glare, is suitable for secondary trunk roads and branch roads.
Reference light distribution of Semi cut-off luminaire;
Product link:
2x2 led lens MEW TypeIV-Very Short
2X2 led lens street light IES TypeII-M
3. The Non Cut-off light distribution Luminaire
The maximum light intensity direction of the lamp is not limited, And the maximum light intensity in the 90° angle direction does not exceed 1000cd. Suitable for bicycle lanes, and sidewalks.
Reference light distribution of no cut-off luminaire;
Product link:
2x2 led lens 5050 leds T2M-No backlight diagram
2x2 led lens 5050leds T2M-With backlight diagram
The three types of luminaire are summarized as follows;
|
Type of Luminaire |
Imax Direction |
The max allowable value of the light intensity emitted in the specified angle direction |
|
|
90° |
80° |
||
|
Cut-off Luminaire |
0°~65° |
10cd/1000lm |
30cd/1000lm |
|
Semi-Cut-off Luminaire |
0°~75° |
50cd/1000lm |
100cd/1000lm |
|
Non-Cut-off Luminaire |
-- |
10cd |
-- |
Glare control:
lens Cut-off luminaire＞Semi Cut-off luminaire＞Non Cut-off luminaire
Power Efficiency:
lens Cut-off luminaire＞Semi Cut-off luminaire＞Non Cut-off luminaire
