Do LED lights attract flies?

Quick overview

• Flies are attracted to specific UV wavelengths
• LED light traps can effectively attract and capture flies when properly designed
• Wavelength consistency plays a key role in long-term fly trap performance
• Different environments require different fly trap types and placement strategies
• Effective fly control combines traps with sanitation, exclusion, and monitoring

Fly activity can create real challenges for businesses. In food handling, healthcare, hospitality, and warehousing, even a small issue can affect hygiene standards, disrupt daily operations, and adversely impact customer confidence.

That’s why many businesses invest in fly control solutions, such as insect light traps that use LED lighting. But to what extent are flies attracted to LED lights, and how well do these systems work?

Are flies drawn to LED light traps?

In the right conditions, flies can be attracted to LED lights, but not all light is the same. Flies respond to specific wavelengths of light, particularly in the ultraviolet (UV) range. Standard indoor lighting is designed for human visibility, not for attracting insects, so it has a limited effect on fly behavior.

Commercial insect light traps are different. They’re designed to emit light within the range that flies are naturally drawn to. LED light traps can be highly effective when designed for commercial fly control and installed correctly. Performance depends on more than just the light source; a well-designed system also needs to:

• Attract flies consistently
• Capture them in a hygienic, contained way
• Maintain performance over time

LED technology supports this by providing a more stable light output than older systems. It can also help reduce maintenance and energy costs, both of which are important factors in busy commercial environments. Modern solutions, such as our Lumnia range of insect light traps, reflect this shift. For example, LED-based units can use up to 79% less energy than traditional fluorescent models and may offer lamp lifespans of up to four years.^1,2

Why the type of light matters

It’s easy to assume brighter light means better results. In reality, flies are not drawn to brightness; they are drawn to wavelength. Research shows that many fly species are most responsive to UV light in a specific range. If a trap emits light close to that range, it is more likely to attract flies effectively. Consistency is just as important. If the light output drops over time, attraction may also decrease. That’s why long-lasting, stable light sources can make a difference in ongoing fly control.

Choosing the right LED fly trap for your environment

Not every environment has the same needs. The right solution depends on how the space is used and where fly pressure is highest.

• Customer-facing areas – In customer-facing areas of retail stores, hotels, and restaurants, businesses often need traps that are discreet and low-profile, with reduced glare and the ability to keep captured insects out of sight.
• Back-of-house and operational areas – In kitchens, warehouse facilities, and some industrial production areas, the focus is more on effective coverage and catch rate, durability in busy environments, and ease of servicing.
• Regulated or high-risk environments – In more controlled settings, like food processing or healthcare facilities, hygiene and compliance are critical. That means contained capture methods, reliable, consistent performance, and the ability to meet stricter standards.

Models in the Lumnia range are designed to support a variety of these environments, with different models suited to different levels of demand.

LED light alone is not enough

Even the best LED fly control solution works best as part of a broader integrated pest management program. Businesses still need to consider sanitation, exclusion, entry points, waste handling, and areas where flies are most likely to gather. The most effective approach usually comprises a multi-faceted approach:

• Identifying where fly pressure is coming from
• Improving exclusion around doors and access points
• Reducing attractants where possible
• Choosing the right light trap for each area
• Supporting the program with regular servicing

¹ Findings based on comparison study conducted by Rentokil Initial in 2019 between Lumnia models (on Low Power Mode setting) and various fluorescent bulb insect light traps.

² 4-year lamp life based on manufacturer testing of Lumnia LED lamps; lifespan percentage based on available competitor claims as of October 2023.