An ebook for first-time red light buyers. Within 10 minutes, most first-time buyers can rule out half the options by checking just four numbers.

The Four Number Filter — your core framework for smarter comparison shopping:

• Choose the size range before the big number — panel size narrows your options faster than any spec
• Read working distance before power — irradiance at your actual use distance matters more than peak output
• Match session fit before display language — how the device fits your daily routine beats feature labels
• Understand warranty value — coverage terms reveal more about build quality than marketing copy

Key buying rules:
→ Read for fit before finish
→ Read for working distance before power
→ Read for daily use before display language

Download instantly. Read in under an hour. Start narrowing your shortlist today.

Your first week: use the four numbers to narrow choices, ignore hype, and build a short list of devices worth considering.