How to Make Mac Night Mode Darker: Beyond Dark Mode

You turned on Dark Mode and assumed that was the job done. The trouble is that Dark Mode makes a screen dark the way sunglasses are dark, which cuts the glare and leaves the color of the light alone.

If you're searching for how to make Mac night mode darker, the real answer has very little to do with brightness and almost everything to do with color temperature. For other screens, see our guide to blue light filters for computer screens.

Why Your Mac's "Dark Mode" Isn't Actually Dark Enough

Dark Mode on Mac replaces white interface backgrounds with dark gray, which lowers the total luminance of your screen. What it doesn't change is the spectral makeup of the light your display emits, so a dark gray pixel at the default daytime white still produces the same proportion of blue light as a white pixel at that same white, only less of it in total.

That distinction matters because the melanopsin receptors in your retina are most sensitive to light around 460 to 480nm, which is deep blue. Dark Mode deals with intensity and ignores wavelength entirely.

After sunset a screen that looks dark is still sending out blue light.

The Three Tiers of Mac Night Mode

Your Mac has three distinct ways to reduce the screen's impact at night.

Tier 1 changes how bright your interface looks and leaves the spectrum alone. Every warmth tool past it changes the spectrum, and they differ in how far they go: Night Shift stops at a warm white, f.lux reaches a deep orange at its warmest preset, and Sundown reaches a deep red. The further the shift, the less blue reaches the cells behind blue-light-driven sleep disruption.

How to Make Night Shift Darker on Mac

To max out Night Shift, go to System Settings → Displays → Night Shift and drag the color temperature slider all the way to "More Warm." That gets you a warm white, the color of a warm incandescent light bulb, and it is the absolute ceiling Apple allows. To compare that warm white with the other settings on your own screen, try Sundown's Blue Light Calculator.

At its warmest, Night Shift still passes a good share of the display's blue channel. For a deeper comparison of what Night Shift does against third-party options, see our Night Shift vs f.lux breakdown.

That doesn't make a warm white worthless, since it is warmer than the default daytime white. But a randomized crossover trial in PNAS showed that evening screen light pushed dim-light melatonin onset more than 1.5 hours later, and that study did not test whether warming the screen to a warm white prevents that delay.

What Actually Happens to Your Sleep When Your Screen Is Too Bright

The pathway is direct and well documented.

Blue light at 460nm enters your retina and hits the intrinsically photosensitive retinal ganglion cells (ipRGCs) that express melanopsin. These cells signal your suprachiasmatic nucleus, the brain's master clock, to suppress melatonin production, so your body concludes it is daytime and sleep pressure drops.

Here are the numbers. In a Harvard-led lab study, 460 nm blue light produced twice the melatonin suppression of 555 nm green light at equal photon density (Lockley, Brainard and Czeisler, 2003), along with a two-fold greater circadian phase delay. And in the National Sleep Foundation's 2022 Sleep in America Poll, 58% of US adults said they often look at screens in the hour before bed.

Every study behind these numbers is listed, with its limits, on the Sundown science page.

Some MacBook displays dim the backlight with PWM, and whether yours does depends on the model (NotebookCheck found it on the 2020 MacBook Air's Retina display). PWM (Pulse Width Modulation) dims by switching the light on and off faster than your conscious vision can detect, and flicker is linked to headaches in sensitive people, as our screen flicker headache guide explains. So on those displays, trying to make your screen darker by turning the brightness down can actually make things worse. For what the flicker studies do and do not show, see Screen Flicker and Digital Eye Strain: The Evidence.

How Do You Go Beyond Night Shift Into Deep Red?

Third-party apps can get past the warm white ceiling of Night Shift, so the question becomes how far each one goes and what else it brings.

f.lux reaches a deep orange that is meaningfully deeper than Night Shift. Its warmest preset is called Ember. That is a real improvement, but deep orange is still not red and some of the 460nm signal still gets through. For reducing blue light on MacBook Pro during casual evening use f.lux works fine, although it leaves a gap if you want a red screen after 9 PM.

Sundown reaches a deep red like the color of dying embers, and at that setting the gamma table drives the blue channel to zero. It also has a Flicker-Free Mode, which holds the backlight at full power and dims through the gamma table instead, and an anti-dithering mode aimed at temporal dithering, so one app handles both the color and the way the screen dims.

Mac Night Mode Apps Compared: Night Shift vs f.lux vs Sundown

For the full feature-by-feature comparison including additional apps, see our blue light app for Mac guide. This is the core comparison for the three tools most people end up choosing between:

Night Shift is free and built in, so if you have never used any night mode tool, turn it on tonight.

f.lux is a meaningful upgrade. Switching from f.lux to something deeper makes sense once you realize that its warmest setting is still deep orange and not red.

Step-by-Step: Make Your Mac Screen as Dark as Possible Tonight

This takes you through all three tiers and takes about five minutes.

Step 1, Dark Mode: Go to System Settings → Appearance → Dark. This flips the interface to dark backgrounds, and although it won't change the color of the light, it lowers total luminance and pairs well with a color filter.

Step 2, Night Shift at maximum (if you are not installing anything): Go to System Settings → Displays → Night Shift, set the schedule to "Sunset to Sunrise" or to custom hours, and drag the color temperature slider all the way to "More Warm." That gives you a warm white as a baseline. If you work nights or a rotating schedule, our guide to shift work sleep and your Mac screen covers setting this by clock time instead of sunset.

Step 3, Sundown: Download it from trysundown.com, drag it to Applications and launch it. Turn Night Shift off first, because two apps changing the display color at once give unpredictable results. Click the menu bar icon and drag the Warmth slider to the right, toward red; at the far right it reaches a deep red, its warmest step. You can also build a custom schedule by time of day.

Step 4, Flicker-Free Mode: In Sundown's Settings, turn on Flicker-Free Mode. It holds the hardware backlight at 100% and dims through the gamma table instead, so the dimming doesn't rely on the backlight's PWM. It is worth turning on if your MacBook's display dims with PWM.

Step 5, keyboard shortcut: Sundown supports a global hotkey that toggles the filter on and off. Set one up for the moments when you need accurate color during an evening session, like photo editing or video grading.

With Dark Mode and Sundown on, the blue channel is turned off at the deep red setting while the text stays readable and navigation still works, and the screen looks deep red.

FAQ

Does dark mode reduce blue light on Mac?
Only by cutting all light. Dark Mode lowers total screen luminance, so less blue light reaches you, but the color temperature stays at ordinary daytime white and the share of that light which is blue does not change. Open a white web page and the full amount comes back.

How do I make Night Shift darker on Mac?
Go to System Settings → Displays → Night Shift and drag the slider all the way to "More Warm." That maxes out at a warm white. For deeper warmth (from a deep orange to a deep red) you need a third-party app like f.lux or Sundown.

Is f.lux better than Night Shift?
f.lux reaches a deep orange against Night Shift's warm white ceiling. Sundown goes deeper still at a deep red and adds a flicker-free mode. See our full Night Shift vs f.lux comparison.

Can Night Shift cause screen flicker?
Night Shift itself does not cause flicker. But some MacBook displays dim the backlight with PWM, depending on the model, and that invisible strobing is linked to headaches in sensitive people. Sundown's flicker-free mode takes a different route, keeping the backlight at 100% and dimming through the gamma table instead, so the dimming doesn't rely on PWM.

Dark Mode is step one and Night Shift is step two. Sundown takes your Mac to a deep red, where the blue channel is driven to zero. Start your 7-day free trial at trysundown.com.

Further reading

• How to turn on Night Shift on a Mac: the settings, the schedule, and how to turn it off again.
• Dark Mode vs Night Shift vs True Tone: what each built-in setting actually changes.
• Sundown vs Night Shift: how much warmer you can go past Apple's slider.