PGari Glowee: Mac brightness with window spotlight
MacBook Pro brightness: how to get past the slider
Short answer: MacBook Pro brightness is capped by software, not by the screen. A MacBook Pro with a Liquid Retina XDR display can emit far more light than the brightness slider lets you use. Apple's own specifications list 1,600 nits peak and 1,000 nits sustained for HDR content, but only 500 nits for everything else on the 2021 and early-2023 models, and 600 nits on the November 2023 models. Press F2 until the slider is full and you are still looking at a panel running well below what it can do. The rest of that range is reserved for HDR video. An app such as PGari Glowee opens part of it for ordinary work: up to 1.5× the slider's maximum, across the whole screen or only in the window you are using.
This page covers every way to raise the brightness on a Mac, in the order you should try them, and is honest about which Macs can go further and which cannot.
First, make sure macOS is not holding the screen back
Most "my MacBook screen is too dim" problems are settings, not hardware. Check these before anything else.
- Use the brightness keys. F2 raises brightness, F1 lowers it. Hold Option + Shift while pressing them to move in smaller steps.
- Turn off automatic brightness. Open System Settings → Displays and switch off Automatically adjust brightness. The ambient light sensor lowers the screen in a dim room, which is exactly when the change is easiest to notice.
- Look at your battery settings. System Settings → Battery lists Slightly dim the display on battery among its additional options (behind the Options button on earlier versions of macOS).
- Check True Tone and Night Shift. Night Shift shifts the screen toward warmer colors, and True Tone adjusts both the color and the intensity of the display to the light around you. Turn them off to compare.
- Use Control Center. Click Control Center in the menu bar, then Display, and drag the slider.
If the slider is at the top and the screen is still not bright enough, you have reached the limit macOS sets, not the limit of the display.
Why full MacBook Pro brightness is not full brightness
Apple builds the MacBook Pro's XDR display to show HDR video, and HDR needs headroom: highlights that are several times brighter than the white of a document. To keep that headroom available, macOS caps ordinary content, which Apple calls SDR, well below the panel's maximum.
| MacBook Pro 14″ and 16″ | SDR (slider at maximum) | XDR, sustained full screen | XDR, peak |
|---|---|---|---|
| 2021 and early 2023 (M1, M2) | 500 nits | 1,000 nits | 1,600 nits |
| November 2023 (M3) | 600 nits | 1,000 nits | 1,600 nits |
| M4 and later (2024 onward) | up to 1,000 nits outdoors | 1,000 nits | 1,600 nits |
Source: Apple technical specifications for each model. The XDR figures apply to HDR content only.
So on a 2021 or early-2023 MacBook Pro, the slider at 100% gives you half of what the display sustains and under a third of its peak; on the November 2023 models it is 60 percent and a little over a third. That is why the same Mac looks brilliant playing an HDR film and flat in a spreadsheet beside a window. On the M4 and later models Apple specifies up to 1,000 nits for ordinary content, but for bright outdoor light only.
How to make a MacBook Pro brighter than the slider allows
The extra range is reachable because macOS exposes it to apps as extended dynamic range (EDR). A brightness app can put the display into HDR mode and then scale what is drawn on it. There are two ways to do that, and they do not look the same.
The overlay method draws a bright layer over the screen. It is simple, and it washes out color and flattens contrast, because you are looking through a sheet of white.
The panel method leaves the picture alone and asks the display for more light. This is what PGari Glowee does: it drives the XDR panel into HDR mode and scales the display's gamma table linearly, so every shade rises by the same proportion. There is no tone-mapping change, no color shift and no white layer. Photo and design work keeps the colors you set.
Glowee has three levels. Each one scales the display's gamma table by a set factor, within the headroom the display has available at that moment:
| Level | Gamma factor (slider maximum = 1.00) |
|---|---|
| Low | 1.20× |
| Medium | 1.38× |
| Max | 1.50× |
Turn it on from the sun in the menu bar, or press ⌃ ⌥ ⌘ G from any app.
Light one window instead of the whole screen
A brighter screen is a brighter everything, including the parts you are not reading. Glowee's Boost Area lets you choose where the light goes:
- Whole Screen lifts the entire display.
- Active Window lifts only the window you are working in. Click another window and the light follows.
- Pinned keeps the light on one window while you move around the rest of the desktop.
Working outdoors on a document, this is often the better answer: the page you are reading gets the panel's extra light, and the rest of the screen stays where it was.
What happens when macOS resets the display
Night Shift, True Tone and sleep can all reset the display's settings. Glowee notices the reset and restores your level within two seconds, and it re-attaches to your displays after sleep at the level you left.
Which Macs can go past the slider, and which cannot
This depends on the display, not on the app.
Can be boosted (they have EDR headroom):
- MacBook Pro 14″ and 16″, 2021 and later, with Liquid Retina XDR
- Apple Pro Display XDR
- Other EDR-capable external displays. Glowee lifts every connected EDR display at the same time, so a Pro Display XDR beside the built-in panel rises with it.
Cannot be boosted: the MacBook Air and other Macs whose displays have no XDR panel. Their slider maximum is the most light the screen produces, and no software changes that. A lighter layer drawn over the picture makes it paler, not brighter. On these Macs the useful tools are the settings in the first section, and, if your real problem is a busy screen rather than a dim one, dimming the windows you are not using, which works on any display.
What more brightness costs
Running a display brighter uses more power and generates more heat, exactly as raising the built-in brightness slider does. Turn the boost off when you are back indoors. Glowee's shortcut exists for that: one chord on, one chord off.
The brightness boost is not captured in screenshots or screen recordings, so a recording made on a boosted screen looks normal to the people who watch it. If you want viewers to see where to look, that is a different tool: Spotlight dims everything except your window, and it is captured in recordings.
Questions people ask about MacBook Pro brightness
Can I make my MacBook screen even brighter?
On a MacBook Pro with a Liquid Retina XDR display, yes. The slider stops at the SDR limit, and the display has HDR headroom above it that an app can open for ordinary content. Glowee raises it by up to 1.5×. On a MacBook Air, no: the slider's maximum is the display's maximum.
Why is my Mac screen so dark on full brightness?
Usually one of three things: automatic brightness is lowering it for the room you are in, a battery setting is dimming it, or you are comparing it with HDR video, which macOS allows to be far brighter than a normal window on the same screen: up to 1,600 nits against 500 or 600.
How bright is 1,600 nits?
A nit is one candela per square meter. At 1,600 nits a highlight is about three times brighter than the white of a document on a 2021 or early-2023 MacBook Pro at full slider, where Apple specifies 500 nits. Apple specifies that figure for HDR highlights, not for a full white screen, where the sustained figure is 1,000 nits.
Can you adjust the brightness in HDR mode?
Yes. The brightness keys still work while HDR content plays, and the HDR highlights stay brighter than everything else on the screen.
How do I stop my MacBook from dimming by itself?
Switch off Automatically adjust brightness in System Settings → Displays, and Slightly dim the display on battery, which System Settings → Battery lists among its additional options. If the dimming happens only after a minute without input, that is the display sleep timer in System Settings → Lock Screen.
Does changing brightness this way affect color?
Not with the panel method. Glowee scales the gamma table linearly and leaves tone mapping alone, so colors stay where they were and only the light output changes.
Is there a free way to try it?
Glowee is free for 7 days with every feature unlocked and no account. After that it is a one-time purchase — one Mac, or three Macs on one key, with a 30-day refund.
Try it on your own screen
PGari Glowee is one menu bar app, under 2 MB, for macOS 13 or later on Apple silicon and Intel. It installs no kernel extensions and no background helpers; quit it and the display returns to normal.
More Glowee guides
- An ADHD focus app for Mac: what a screen tool can and cannot do
- How to dim inactive windows on a Mac
- How to focus on a window on a Mac
- How to highlight the active window on a Mac
- How to screen record on a Mac, with a spotlight on the window you are explaining