Wasps being attracted to light sources is a common problem many people face. If you have noticed wasps congregating around lamps, bulbs, or other light fixtures, you’re not alone. There are a few key reasons why wasps seem drawn to these light sources.
Wasps are naturally phototactic
Phototaxis refers to an organism being attracted to light. Many insects, including wasps, exhibit positive phototaxis. This means they instinctively move toward light sources. It’s an evolutionary adaptation that likely helped wasps and other day-flying insects navigate toward open areas while avoiding dense foliage and shadows. The light gives them a focal point.
So when you have a bright artificial light source turned on, it can draw in nearby wasps just like a flame attracts moths. The wasps may circle closer and eventually land on the light or a nearby surface.
Light produces warmth attractive to wasps
Another reason wasps are drawn to light bulbs and lamps is that these lights give off warmth. Wasps are cold-blooded, meaning they rely on external temperatures to regulate their body temperature. When they detect a heat source like a light bulb, they may be compelled to move toward it and congregate there to stay warm.
Light triggers hunting and scavenging instincts
In addition to navigation and warmth, light also triggers the natural hunting and scavenging behaviors of wasps. Bright light often indicates bountiful foraging opportunities for many insects.
Some lights attract flying insects, producing concentrations of prey that draw in hungry wasps to feed. Other types of light cause reflectiveness and shadows that can fool wasps into thinking there is water or food sources available.
Ultraviolet wavelength light is highly attractive
Not all light wavelengths are equally appealing to wasps. Ultraviolet (UV) light seems to be particularly powerful at attracting them.
Many insects including wasps can see in the UV spectrum, which humans cannot. Standard incandescent and LED lights emit some UV wavelengths, making them more likely to draw in wasps compared to low-UV CFL bulbs.
| Light Source | UV Emissions | Wasp Attraction Level |
|---|---|---|
| Incandescent bulb | High | High |
| CFL bulb | Low | Low |
| LED bulb | Moderate | Moderate |
So if you notice wasps flocking to a certain light fixture, switching to a lower UV CFL bulb in that location may help. Covering the light to block some of the emissions can also deter wasps.
Light reflects off shiny surfaces
Sometimes wasps are drawn to lights not because of the light itself, but rather reflections or glare coming off nearby surfaces.
Shiny metal fixtures, glass casings over bulbs, glossy painted walls, or reflective floors near light sources can all glint and cast reflective UV light. These reflections mimic water sources or food sources to foraging wasps.
So the combination of a bright light plus reflective surfaces can create a powerful wasp attractant. Consider repositioning the light or using matte finishes on surrounding surfaces to cut down on glare.
Night lighting attracts more wasps
While wasps may investigate and fly near lights during the day, the issue often gets worse at night. Lights become much more pronounced and conspicuous in the darkness.
Nocturnal insects swarming a light source also signal a prime feeding opportunity for wasps. And nighttime light pollution can confuse and disrupt wasp navigation, causing them to become trapped circling a bright bulb.
So you may notice the most significant wasp issues under outdoor security lights or porch lighting left on overnight. Keeping outdoor lighting to a minimum at night can help reduce appeals to wasps.
Certain locations attract more wasps
Where the light fixture is positioned can also make a difference. Since wasps form nests and colonies in cavities like tree hollows, attics, and covered porches, having a light source right next to one of these areas can practically guarantee issues. The combination of an active wasp nest and a conveniently located bright light is very attractive.
Lights under roof overhangs, by trees, or near known nesting sites tend to see the heaviest wasp traffic. If possible, move the light further away from nesting hotspots to make it less conspicuous.
Times of year with more wasp activity
Some times of year will naturally have more wasp activity and responses to light sources. Late summer and early fall is peak wasp season in most regions.
Nests have grown to full size, producing hundreds of workers to search for food and defenders to patrol the colony. This is when interactions with humans also increase. Reducing outdoor lighting during this period can help minimize attractions.
Overwintered queen wasps also become active in spring while establishing new nests. Early season lights can draw them in before substantial nest sites are even built. Being proactive about light placement and usage in spring and fall can prevent future issues.
Making lights less appealing to wasps
If wasps continually swarming light fixtures becomes an ongoing nuisance and concern, there are some steps you can take to make the lights less enticing:
– Switch exterior bulbs to lower UV CFLs to reduce attractions.
– Use recessed directional lighting pointed down instead of wide floodlights.
– Cover or shield lights to block some emissions.
– Use yellow bug bulbs which are less attractive than white or blue light.
– Install lights far away from nearby nesting sites.
– Choose matte finishes on surfaces around lights to minimize glare.
– Turn lights off at night whenever possible.
– Reduce overall outdoor lighting during peak wasp season.
– Inspect for nearby nests and have them removed if necessary.
Avoid harming beneficial wasps
While certain wasp species like yellowjackets can be aggressive pests, others are beneficial predators that control garden and crop pests. Be sure only to use deterrence and management methods against nuisance wasps, not pollinating wasps and mud dauber wasps that cause no issues.
When to get professional help
If you have identified an active wasp nest near a light fixture, having it removed is the best solution. Trying to deal with large aggressive nests close to homes yourself carries a high risk of getting stung. Consult a licensed pest control professional to inspect and properly eliminate the nest.
Conclusion
Wasps naturally follow light cues, get drawn in by warmth and food opportunities, and become confused by light pollution, leading them to congregate around outdoor lights. Strategic placement of lights, minimizing light usage during peak seasons, and switching to low-UV bulbs can all help reduce the influx of attracted wasps over time. But having professional pest control on standby to remove dangerous nest sites is key to fully protecting your property against large colonies. Stay vigilant for wasp problems during the warmer months and take proactive lighting precautions to discourage them from invading your outdoor living spaces while enjoying evenings outdoors.
