🔧 Free Tools
LED Lighting Calculators
Free, instant lighting calculators for procurement professionals, engineers, and contractors. Calculate fixture counts, retrofit ROI, and verify glare/color specs — no signup required.
Fixture Quantity Calculator
Calculate how many LED fixtures you need based on room dimensions, target lux, and fixture type. Uses the simplified lumen method (CU≈0.65, LLF≈0.80).
Affects spacing recommendation
Auto-set from space type. Override for custom.
Auto-set from fixture type.
Default 0.65. Lower for dark surfaces.
LED Retrofit ROI Calculator
Calculate energy savings and payback period when replacing old lighting (metal halide, fluorescent, HPS) with LED. Perfect for retrofit project proposals.
Including ballast/driver losses
6 days/week = 312 days
Total investment = unit cost × quantity
UGR Glare & SDCM Color Consistency Checker
Quick-check your fixture specs against industry standards. Avoid project sign-off failures due to glare complaints or color mismatch.
💡 Select both values above to see compliance assessment. Results update instantly.