Why Your Screen's Night Mode Isn't Enough

Night Mode Is Everywhere

Every modern device now has a "Night Mode," "Night Shift," or "Blue Light Filter":

• macOS Night Shift
• Windows Night Light
• iOS Night Shift
• Android Night Light
• f.lux (third-party)

They all do the same thing: shift colors warmer after sunset to reduce blue light. And they work—for that specific problem.

But There Are Two Problems

Screen-related eye strain has two distinct causes, and night mode only addresses one:

The Flicker Problem

When you dim your screen for nighttime use, the backlight switches on and off rapidly. This is called PWM (Pulse Width Modulation).

       WHAT HAPPENS WHEN YOU USE NIGHT MODE
═══════════════════════════════════════════════════

  Night Mode ON + Brightness at 50%:

  Colors:     🟡 Warm and orange (blue removed)
  
  Backlight:  ████░░░░████░░░░████░░░░████░░░░
              Still flickering at 240Hz!

  Your eyes:  😣 Still being strobe-lit
  
  Result: Better for sleep, still bad for comfort

Why This Matters

Many people who enable night mode and dim their screens still experience:

• Eye strain after extended use
• Headaches, especially at lower brightness
• That "can't quite get comfortable" feeling
• Fatigue even with warm colors

They blame blue light, but the real culprit is often the flicker that gets worse as they dim.

The Complete Solution

To truly protect your eyes, you need to address both problems:

              THE TWO-PROBLEM SOLUTION
═══════════════════════════════════════════════════

  PROBLEM 1: Blue Light
  ─────────────────────────────────────────────────
  Solution: Shift colors warmer (reduce blue channel)
  
  
  PROBLEM 2: PWM Flicker
  ─────────────────────────────────────────────────
  Solution: Keep hardware brightness at 100%
            Use gamma-based software dimming


  TAP ZAP: Solves BOTH with one app
  ─────────────────────────────────────────────────
  • Color Temperature slider → removes blue
  • Brightness slider → gamma-based, no flicker
  • Hardware at 100% → backlight always on

The Night Mode Paradox

Here's the irony: people typically use night mode when preparing for sleep, which means they also want a dim screen. But dimming activates PWM, potentially causing more immediate discomfort.

How to Fix It

1. Turn off your OS night mode (optional but recommended)
2. Set brightness to 100% in System Settings
3. Launch Tap Zap
4. Adjust both sliders to your preference