Question 1

What are the requirements for photometric testing when determining the BUG rating of lamps?

Accepted Answer

In accordance with the recommendations of the IES Test Procedures Committee, photometric testing must include upper hemisphere data; only when the luminaire exhibits zero light emission above 90° vertically (e.g., luminaires with flat lenses and opaque sides) may upper hemisphere data be omitted. Furthermore, photometric test density must include values at intervals of no more than 2.5 degrees vertically (γ degree).

Question 2

What is the best height for street lights, or the higher the better?

Accepted Answer

The BUG rating is important because inappropriate lighting (choosing LED lights with the wrong BUG rating) can have serious impacts on humans, wildlife, and the environment.

For humans: Outdoor lighting with a high "BUG rating" can penetrate windows, causing light pollution and disrupting sleep. Similarly, a higher G rating often causes glare, leading to discomfort and even disability.

For wildlife: A higher U rating means more light is directed towards the sky, resulting in skyglow. Many animals rely on the night sky and stars for navigation, and skyglow and excessive lighting disrupt their navigation systems. Artificial light also exposes nocturnal animals, increasing their risk of predation.

For the environment: In addition to affecting humans and wildlife, excessive and unnecessary lighting leads to energy waste and increased carbon footprint. This exacerbates global warming and negatively impacts the Earth's ecosystems.

The BUG rating provides important guidance for lighting design. By combining lighting scene analysis with the BUG parameters of the luminaires, we can optimize lighting solutions to ensure adequate lighting while avoiding unnecessary backlight, uplight, and glare in practical applications.

Question 3

How to reduce light pollution?

Accepted Answer

There are two methods to reduce light pollution. One is the BUG rating method, which we introduced in the article. The other is the calculation method, which usually refers to lighting design. Through lighting simulation, we can determine how much light is directed towards the sky, such as the ULR (Upward Light Ratio) in sports lighting. Similarly, we can also use simulation to assess how much light is directed outside the road. Relatively speaking, this method is more direct but requires a certain level of professional expertise.

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BUG rating – Indicator you must know for outdoor lighting

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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