This article explains why comparing LED and incandescent brightness by watts no longer works, and why lumens are the correct baseline in 2026. It provides a quick lumen equivalency table for common incandescent wattages, then breaks down why two lights with the same lumens can look different due to beam angle, optics, fixture efficiency, color temperature, glare, and flicker. For outdoor lighting, it clarifies the difference between total lumens and delivered illuminance (lux), and ends with a practical checklist to evaluate LED retrofit candidates more confidently.
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