How Deer See Flash and Infrared
Can Deer See Infrared Light?
Not the infrared itself. Deer are dichromatic: they have two types of color cones where we have three. One is tuned to short, blue wavelengths and the other to green, which is why deer see blue and green well in low light. They have no cone for red, so the long-wavelength end of the spectrum reads dim and washed out to them, and infrared sits past red entirely.
What a deer can sometimes notice is the glow. Low-glow cameras use 850nm LEDs, which leak a little visible red light that shows as a dull red dot when they fire. No-glow cameras use 940nm LEDs, far enough into the infrared that no visible glow comes off them.
Can Deer See a Trail Camera Flash?
It depends on the flash:
- White flash puts out light across the whole visible spectrum, including the blue deer see best. Deer can clearly see it. That does not guarantee they bolt, but it is the most noticeable option.
- Low-glow infrared (850nm) shows a faint red glow on the LEDs. Deer can often detect it up close, though it is far less obvious than white flash.
- No-glow infrared (940nm) shows no visible glow. It is effectively invisible to deer.
Do Trail Cameras Flash at Night?
Yes. The flash only fires in low light, and every game camera uses one of three types:
| Flash type | Night image | Visible to deer? |
|---|
| White flash | Full color | Yes, the most visible |
|---|
| Low-glow IR (850nm) | Black and white | Faint red glow, often detectable |
|---|
| No-glow IR (940nm) | Black and white | Effectively invisible |
|---|
The trade-off is image quality against stealth. White flash gives color photos; no-glow trades color and some night range for near-total invisibility. Low-glow sits between the two and usually reaches farther than no-glow. For pressured deer, the quiet option usually wins.
Do Trail Cameras Scare Deer?
Occasionally, and mature bucks are the ones most likely to react. Kip Adams, Chief Conservation Officer at the National Deer Association, has run white-flash, black-flash and infrared cameras since 1995 and told Outdoor Life he has seen more deer react badly to infrared cameras than to anything else. In the same breath he said human scent has a larger impact than any type of camera (Outdoor Life).
That is the part worth acting on. Every check-in leaves boot scent and disturbance on the trails you most want left alone, and deer that get bumped weekly shift to night movement or leave. A cellular trail camera sends photos to your phone, so you can scout a spot without walking in at all.
Bottom line: a no-glow camera you check four times a season will bother far fewer deer than a camera you visit every weekend, whatever its flash. Manage your visits first.
