Red Light Headlamps

What makes a red light headlamp different

Every headlamp throws white light. A red light headlamp adds red LEDs and a mode that runs them, and the maker or the Amazon listing says so. That's the rule for the table on this page: headlamps with a red light mode, as the maker or the listing states it.

The white-light specs (lumens, throw, runtime, IPX) are the same story on every lamp, so I left them on the headlamps page. Here it's all about the red mode: why it works, what deer make of it, and the handful of controls that decide whether red is useful or just a checkbox.

Why a headlamp with red light protects your night vision

The National Park Service explains it with one chemical. Rods, the cells at the edge of your eye that see in dim light, need something called rhodopsin to work. Your body doesn't make it in daylight. It starts after about 20 minutes or so of low light, and you get the full benefit somewhere in the 20 to 40 minute range.

Then you click on a bright white light. The NPS says it only takes a few seconds of bright light to break rhodopsin down, and the rods quit. The whole cycle starts over. Deep red light doesn't trigger that breakdown, which is why astronomers use it.

Princeton Tec describes the other half of the effect. Your pupils open wide in the dark and close down in bright light. A strong white beam can leave you seeing less once you turn it off, because your eyes have to open back up.

Two details from the NPS matter for shopping. First, dim red is best. Most lights aren't one pure color, so even red light carries a little of other colors, and a bright red can still cost you some dark adaptation. Second, the goal is the light you need and no more. A red mode with a low setting beats one that only comes in "bright."

What deer see when you walk in with red light

Here's where hunters come in. A 2005 University of Georgia Research Magazine article reported that deer see color much as people do, but with red-green color blindness. One researcher said a car's red taillights would probably look black to a deer. The same work suggested deer may see blue better than we do.

Outdoor Life's write-up of the UGA research adds the later findings. A 1992 UGA study found reds and oranges didn't register in a deer's brain the way they do in ours. A later study mapped the photoreceptors in the deer retina. The researcher behind it described those long red wavelengths as looking "more like a muted yellow or a muted brown" to a deer. The same article quotes a UGA researcher saying deer eyes are most sensitive in twilight, which is exactly when you're walking in.

So red is the right color, but it's not a cloak. Princeton Tec puts it plainly: red light isn't completely invisible to animals, it's just less likely to startle them than white. Keep it dim, keep it low, and keep it off once you're settled.

What to look at on a red light headlamp

The table marks red light yes or no. That's the starting line. These are the details that decide whether you'll actually use it.

Reach red without passing through white

This is my one opinion for this page: a red mode you have to click through white to reach is the wrong red mode. The reason is the NPS point above. A few seconds of white light is all it takes to undo your dark adaptation, and cycling through modes takes a few seconds.

Some lamps fix this in the controls. One maker's spec sheet says its red night-vision mode activates without cycling through the white mode. Others use a separate button or a long press for red. Look for that line in the maker's description or manual. If it isn't there, assume you'll flash white first.

Red-first and mode memory

One maker says all of its headlamps default to red light first. It also says to check whether a lamp stays on red when you turn it off, because some lights reset. A lamp that remembers red means you can switch it off in the stand and back on for the walk out without a white flash.

Brightness memory is the same idea for the level. One maker lists a memory feature that turns the lamp back on at the brightness you chose, instead of a default setting. Red-first, red memory or a dedicated red button all solve the problem. Pick one.

Red brightness levels

Princeton Tec says most red-light headlamps offer more than one brightness level. Lower red settings save battery, and higher ones add visibility while keeping the night-vision benefit. One maker's red mode also has dimming and a strobe.

Low red is for camp and the last stretch near your stand. A brighter red helps on rough ground. If a lamp has only one red level, it's usually a close-range light. Princeton Tec describes the red LEDs on one of its lamps as providing close-range lighting, which is a fair description of red in general.

Controls you can find with gloves

Princeton Tec's advice is easy controls that let you switch settings quickly. In November that means a button you can feel through a glove, in the dark, without pressing the wrong one. Try it at home with your hunting gloves on. Kitchen table first, deer woods second.

Green and blue: the other colors in the table

The table also shows a green light column, and fewer lamps have it. One maker lists red night-vision as a standard setting on most of its lights, while extra colors are rarer. If the color you need isn't in the maker's or the listing's description, the lamp doesn't have it.

Test the red mode at home, in the dark

Ten minutes in your own kitchen tells you more than the spec sheet. Turn the house lights off and give your eyes a few minutes. Then run the checks that matter on a dark morning:

• First click: does it come on red, or flash white on the way there
• Off and on again: does it come back in red, at the level you left it
• Lowest red: is it dim enough for the last stretch to the stand
• Gloves on: can you find the red button without looking
• Lock: can you lock it in the bag and switch the lock off by feel

If a lamp fails the first check, learn its workaround now. Some lamps hide red behind a long press or a second button, and the manual will say which. Write it on a strip of tape inside the lid of your bin. Nobody reads a manual at 5 a.m., and I say that as a man who has read every manual in the cabin, including the one for the coffee maker. Twice.

Red, green or blue: which color does which job

Princeton Tec's hunting article splits the colors like this:

• Red: walking in without disturbing animals, keeping night vision, and picking up animal eyes in thick grass or brush
• Green: more contrast, better for spotting animals at a distance and reading fine map detail
• Blue: makes blood trails stand out, because the fluids glow under it; also the color animals detect most easily

That last point matters. Blue is a tracking color, not a walking color. Princeton Tec warns it's the most likely to spook animals. Blood trailing at night is its own job, with dedicated lights on the blood tracking light page.

For most deer hunters, red covers the walk in and the stand. Green is a bonus if you hunt open fields or read a map in the dark.

Where a red light headlamp earns its keep

The walk to the stand

Set the lamp to red the night before so the first click is red. Use the lowest setting that shows you the ground, and switch off once you're settled. Check your state wildlife agency for any rules on lights while hunting, because they differ from state to state.

Camp and the tent at night

Princeton Tec says red light doesn't shine brightly through tent walls, so you can get up at night without waking anyone. It also says red attracts fewer bugs.

At Hemlock Run, the person you don't want to wake is Walt. He claims he's a light sleeper. Nobody has tested that claim on purpose. But white light at 4 a.m. gets you a lecture, and red light gets you a grunt. Real talk: I'll take the grunt.

With a group

Princeton Tec makes the point that red lets people see each other in the dark without blinding one another. Anybody who has turned to answer a question with a white headlamp on knows why. Everyone at the fire ring gets a face full of light, and the conversation stops.

Reading a map or notes

Red light works for reading maps and charts up close. One catch from Princeton Tec: anything printed in red vanishes under red light. If your map marks trails or property lines in red, you'll need white or green for a second. Same goes for anything you marked in red ink yourself. Write the important stuff in pencil or black.

Limits of red light

Red is a dim, close-range color. It's great for keeping your eyes and not so great for detail. You'll lose some color sense, since red ink and red markings disappear under it. It also won't make you invisible to deer, per the UGA work and Princeton Tec. And the NPS says even red light costs some dark adaptation if it's bright.

None of that is a reason to skip the red mode. It's a reason to use white when you actually need detail, and red the rest of the time.

Who should skip a red light headlamp

If you only use a headlamp in a lit campground or for chores in the garage, red adds nothing. If your nights are all trail running at speed, you need a strong white beam more than a red mode. And if you need to see color, like checking wiring or reading a red-marked map, red is the wrong light for that minute.

For everyone else, red is the setting you'll end up using the most and thinking about the least. That's the best compliment a headlamp mode can get.