FAQ
Ask the blunt questions.
Wavelength, medical claims, and whether a laptop is enough — answered without a costume.
Is this red light therapy?
People search this category as red light therapy. The app is a timed red-light session and wellness utility: sit close, 10–20 minutes, Morning Red, Low Light, or a red filter while you work. It is not a medical device and does not treat disease. Calculated output is about 0.2–0.3 mW/cm² at the glass — far below a dedicated panel.
Does it output 660 nm?
Display P3 red’s published dominant wavelength is about 614.9 nm, a color description, not a measured emission peak. The app cannot add a 660 nm LED or 850 nm near-infrared emitter.
What sessions are in the app?
Free Light options include the 15-minute session, 10-Minute Intense, 20-Minute Standard, Morning Red (same 15-minute clock as a morning option, not a circadian claim), Low Light (30 minutes at 35% Dark Red), Evening Wind Down, and the live red filter. Start with the 15-minute session, or the filter if you need to keep working.
Is a laptop enough?
A laptop is not a dedicated panel. Output is calculated, not measured: about 0.2–0.3 mW/cm² at the glass. Equivalent dose or health outcomes have not been established.
Do I need an account?
No. Session data stays on the device. The optional launch list on this site only needs an email so we can tell you when Red Light Display is available.
What Mac do I need?
macOS 14 Sonoma or later, on an Apple silicon or Intel Mac. The beta also needs Apple’s free TestFlight app.
How do I install the beta?
The public TestFlight link is not published yet. When it is, you will install TestFlight from the Mac App Store, open the beta link on the download page, then click Accept and Install. Join the launch list on the download page to hear when it opens.
Does Pro cost money in the beta?
No. In TestFlight, Pro purchases use Apple’s test environment, so you are not charged. A beta purchase does not carry over to the App Store release. Each beta build expires 90 days after it is uploaded.
What does Pro unlock?
Display Boost, multi-display, red filter on every display, custom colors, saved routines, history, and display profiling. $9.99 once. The $0 tier keeps the 15-minute session, Morning Red, Low Light, and the built-in red filter on one display.
Is this a medical device?
No. It is not intended to diagnose, treat, cure, or prevent any disease. If the light is uncomfortable, end the session with Escape or Option-Command-Period. Do not use it if you have photosensitive epilepsy or light-triggered migraine unless a clinician has said it is appropriate.
My screen is stuck red
Press Option-Command-Period, or choose Restore Display Colors in the menu bar. That also ends a running session and stops the red filter. Or run: open -a "Red Light Display" --args --restore-display. If that fails, open System Settings → Displays and re-select the color profile.
Display Boost does nothing
Display Boost uses the HDR headroom of XDR displays (MacBook Pro 14/16 Liquid Retina XDR, Pro Display XDR). On other displays it has no effect and is hidden. A full-field session requests the sustained envelope (Apple’s 1000 nits class), not the 16× highlight peak. Idle current near 1.2 is not a granted envelope.
How do I get a refund?
Pro is a one-time App Store purchase. Refunds are handled by Apple under App Store rules. Email support@redlightdisplay.com if you need help finding the receipt.