Yes, June bugs are strongly attracted to light. If you’ve ever sat on a porch at night and watched them crash repeatedly into your light fixtures, you’ve seen this firsthand. Their attraction isn’t random. It’s driven by the type of light you’re using, specifically how much ultraviolet and short-wavelength energy your bulbs emit.
Why June Bugs Fly Toward Light
June bugs, like most nocturnal flying insects, are positively phototactic, meaning they instinctively move toward light sources. The leading explanation is that they use natural light from the moon and stars to navigate at night. Artificial lights overwhelm this system, essentially trapping them in a loop where they keep circling or flying directly into the source.
What makes June bugs especially noticeable is their size and clumsiness. They’re large, heavy beetles that aren’t particularly graceful fliers to begin with. So when they lock onto a porch light or window, they slam into it loudly and repeatedly, often ending up on their backs buzzing on the ground. This behavior peaks during their most active months (typically May through July, depending on your region), which is why summer evenings bring swarms of them to well-lit porches and entryways.
Which Light Wavelengths Attract Them Most
Not all light is equally attractive to June bugs. Insects can see wavelengths between about 300 and 650 nanometers, but they strongly prefer the range of 300 to 420 nanometers. That corresponds to ultraviolet, blue, and green light. These shorter wavelengths carry higher energy, and a bulb’s UV output is the single biggest factor in how many insects it attracts.
Four types of bulbs are highly attractive to insects, including June bugs:
- Incandescent bulbs
- Compact fluorescent (CFL) bulbs
- Halogen bulbs
- High-intensity discharge (HID) bulbs
All of these emit significant amounts of UV radiation along with their visible light. Incandescent bulbs are particularly wasteful in this regard, converting only about 10% of their energy into visible light. The remaining 90% becomes heat and UV emissions, both of which draw insects in.
How to Reduce June Bugs Around Your Lights
The most effective swap is switching to LED bulbs, which emit little to no UV light. Even when an LED and an incandescent bulb have the same brightness and color temperature, the LED will attract fewer insects simply because it lacks that UV component.
But not all LEDs are equal. The color temperature matters. Bulbs labeled “cool white” or “bluish white” emit shorter wavelengths (below 550 nanometers) and still attract some insects. The best options for keeping June bugs away are LEDs labeled “warm white” or “ultra warm white,” with a color temperature below 3600K. These bulbs push their light output above 550 nanometers, into the yellow-orange range that falls outside the peak sensitivity of most flying insects.
Yellow “bug light” bulbs take this a step further. These are typically yellow-coated LEDs with a peak wavelength between 550 and 600 nanometers, placing them squarely in the deep yellow to orange range. They won’t make your porch completely bug-free, but they significantly reduce the number of insects that congregate around your lights. Many come in standard bulb sizes and fit regular fixtures, so the swap is simple.
Other Practical Steps That Help
Beyond changing your bulbs, a few adjustments can make a noticeable difference. If you have outdoor lights near doors or windows, consider moving them farther from entryways so that any insects they do attract aren’t clustering right where you walk in and out. Shielded or downward-facing fixtures also help by directing light toward the ground rather than broadcasting it outward where flying beetles can spot it from a distance.
Turning off unnecessary outdoor lights during peak June bug season is the simplest solution of all. If you need light for safety or visibility, timers or motion-activated fixtures limit the window of time your lights are on and drawing insects in. Dusk-to-dawn sensor bulbs in yellow LED versions automate this process, turning on only when it’s dark and producing wavelengths that are harder for June bugs to detect.
Indoor lights visible through windows can also pull June bugs toward your house. Closing blinds or curtains on summer evenings keeps that light from leaking outside. This is especially relevant if you have bright, cool-toned lighting inside, since those shorter wavelengths pass through glass and are highly visible to insects.
Why They’re Worse Some Years Than Others
June bug populations fluctuate from year to year based on conditions during their larval stage. The grubs spend months underground feeding on grass roots, and wet, warm springs tend to produce larger adult populations. If you notice a particularly bad June bug year around your lights, it likely reflects favorable conditions in the soil the previous season rather than anything about your lighting setup. That said, the right bulbs will always reduce how many of them end up buzzing around your porch, regardless of how large the local population is.