Moth Attraction by LED Color Temperature

ISEF Category: Animal Sciences

Subcategory: Animal Behavior  ·  Difficulty: Intermediate  ·  Setup: Home Setup  ·  Time: 1 to 2 Months

The Hook

A porch light can act like a moth magnet, but not every white bulb pulls the same way. Warm and cool LEDs give off different mixes of light, and moths may respond to that mix, not just to brightness. You can test this in your own backyard with a simple trap grid and careful counts. Your results can show whether one color temperature draws more moths per night than the others.

What Is It?

Color temperature tells you how a bulb looks, from warm yellow light around 2700K to cool blue-white light around 6500K. Think of it like three different flavors of the same flashlight. The moths see different signals, even when the light seems equally bright to you.

Many moths show phototaxis, which means movement toward light. They often use moonlight and starlight to navigate, so artificial light can pull them off course. In this project, attraction rate means the number of moths visiting, or the number caught near each lamp, over a fixed sampling night.

Why This Is a Good Topic

This topic works well because you can change one variable, color temperature, while keeping the trap setup and counting method the same. It connects to light pollution, backyard ecology, and how human lighting changes nighttime insect behavior. You can learn sampling design, bias control, and basic statistics without needing a university lab.

Research Questions

• How does LED color temperature change the number of moths attracted to each trap in a fixed backyard grid?
• What is the effect of LED color temperature on moth visitation rate per sampling night?
• Does the difference between 2700K, 4000K, and 6500K bulbs change under similar moon phase and cloud cover?
• To what extent does trap position within the grid affect moth attraction at each color temperature?
• Which LED color temperature produces the highest moth species richness near the trap?
• How does LED color temperature affect the ratio of moths to other night-flying insects?

Basic Materials

• Three identical LED bulbs labeled 2700K, 4000K, and 6500K.
• Three matching outdoor fixtures or clamp lamps.
• White collecting sheets, trays, or light boards.
• Measuring tape or surveyor's tape.
• Smartphone with manual camera settings.
• Insect guide for local moth families.
• Weather app or access to local weather data.
• Notebook or spreadsheet for nightly counts.
• Headlamp with red-light mode.
• Outdoor extension cords and weather-safe outlets.

Advanced Materials

• Calibrated spectroradiometer or light meter.
• Portable power meter for bulb output.
• Identical trap housings or light traps.
• Environmental data logger for temperature, humidity, and wind.
• Stereo microscope or macro lens for species-level ID.
• Reference collection or regional moth key.
• R or Python on a laptop for mixed-effects analysis.
• GPS app or coordinates logger for trap position.

Software & Tools

• ImageJ: Counts moths from standardized photos and compares image-based totals.
• R: Tests whether attraction rates differ across bulb types and nights.
• Google Sheets: Organizes nightly counts, weather notes, and trap positions.
• QGIS: Maps trap locations and checks for spatial bias across the grid.
• iNaturalist: Helps sort moth photos into likely groups when you need an ID check.

Experiment Steps

1. Define the response you will measure, such as total moth visits, capture count, or species richness.
2. Fix the trap layout so each bulb color temperature gets the same chance across the grid.
3. Set your control plan for brightness, moon phase, weather, and sampling order before you start.
4. Decide how you will record counts, photos, and uncertain IDs in the same format every night.
5. Plan the analysis method that will compare nights, positions, and bulb types without mixing them together.

Common Pitfalls

• Letting bulb brightness vary with color temperature, which makes attraction differences hard to attribute.
• Moving the trap layout between nights, which blends location effects into the color results.
• Counting insects from different distances or angles, which changes your totals and hides real patterns.
• Skipping weather and moon notes, which leaves you unable to explain big night-to-night swings.
• Mixing moths with all flying insects in one count, which can erase species-level or behavior differences.

What Makes This Competitive

A stronger version of this project controls brightness, position, and weather, then analyzes the data with a method that handles repeated nights. You can go beyond simple totals by comparing moth attraction rates, species mix, or timing of arrivals across bulb types. If you also measure the actual spectrum of each bulb, you can separate color temperature from brightness and make a sharper claim. That kind of careful design makes the project look much more like real ecology research.

Project Variations

• Compare moth attraction on clear nights versus cloudy nights.
• Test whether moths and other night-flying insects respond differently to the same bulbs.
• Add actual spectrum measurements so you can compare color temperature with measured wavelength output.

Learn More

• PubMed: Search review articles on moth phototaxis, light pollution, and nocturnal insect behavior.
• NOAA Moon Phases Calendar: Check moon illumination and cloud context for each sampling night.
• NASA Earth Observatory: Read background on artificial light at night and night ecosystem effects.
• BugGuide: Compare moth family photos and identification notes from a free community reference.
• iNaturalist: Explore local moth observations and learn how people document nighttime insect records.
• Journal of Insect Conservation: Search the journal site or PubMed for peer-reviewed papers on artificial light and insect responses.