Methodology guide
Limits, planning factor, and when to stop shopping this ladder.
Calculator
LED work light size by floor area
Enter floor area in sq ft. Get a 10k / 15k / 21k lumen class or NO_MATCH. Planning budget uses 50 lm/sqft — not a photometric layout.
Result
Worked checks: 150 sq ft → 10,000 · 250 sq ft → 15,000 · 400 sq ft → 21,000 · 500 sq ft → NO_MATCH. classLbs uses lumen ratings for CTA matching.
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