1. Insufficient power of light source: LED 100W street lamp has low power, which may not provide enough brightness and illumination range. In some places that need large lighting range, such as expressway, large parking lots, the light source of 100W may not meet the demand.

2. Quality of light source: The quality of light source directly affects brightness and illumination range. If the LED 100W street lamp uses low-quality LED chips or other light sources, its brightness and illumination range may be limited.

3. Unreasonable optical design: the optical design of street lamps includes reflector, lens and other components, which directly affects the light distribution and lighting range. If the optical design of LED 100W street lamp is unreasonable, the light may not be fully utilized, resulting in insufficient illumination range or brightness.

4. Improper installation position: The installation position of street lamps will also affect the lighting range and brightness. If the LED 100W street lamp is installed in an unreasonable position, such as the installation height is too low or the angle is improper, it may cause the light to not completely cover the area that needs lighting, thus causing the problem of insufficient lighting range or brightness.

5. Environmental factors: Fog, rain, dust and other environmental factors will also affect the lighting range and brightness of LED 100W street lamp. In bad weather conditions, light may be scattered or absorbed, resulting in insufficient illumination range or brightness.

In order to solve the problem of insufficient lighting range or brightness of LED 100W street lamp, the following measures can be taken:

1. Improve the power of light source: choose LED light source with higher power, such as 150W, 200W, etc. To provide a wider illumination range and higher brightness.

2. Choose high-quality light source: choose LED light source with well-known brand and reliable quality to ensure its brightness and lighting range meet the requirements.

3. Optimize the optical design: optimize the optical design of street lamps to ensure the full use of light and improve the lighting range and brightness.

4. Adjust the installation position: adjust the installation position of the LED 100W street lamp according to the actual demand to ensure that the light can cover the area that needs lighting.

5. Consider environmental factors: When designing and installing the LED 100W street lamp, possible environmental factors, such as rainwater drainage and dust prevention, should be considered to ensure that the street lamp can work normally in all weather conditions.