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LED Lighting Glossary & Parameter Dictionary
IEC 60529 · CIE S 017 · EN 60598 · ANSI C78.377 — authoritative definitions for 200+ LED lighting terms covering photometrics, electrical specs, certifications, and smart controls.
Ra 0–100 scale measuring color accuracy under a light source. CRI ≥80 for offices, ≥90 for retail/museums, ≥95 for medical/surgical per CIE 13.3.
Measured in Kelvin (K). Warm white: 2700–3000K. Neutral: 3500–4500K. Cool white: 5000–6500K per ANSI C78.377.
IEC 60529 standard. First digit: dust/solid (0–6). Second: water (0–9K). IP65 = dust-tight + water jets. IP66 = dust-tight + powerful jets.
SI unit of luminous flux — total visible light output. Per CIE S 017. Residential: 400–2,000 lm; Commercial: 2,000–10,000 lm; Industrial: 10,000–75,000 lm.
Lumens per watt — efficiency metric. LED: 100–180 lm/W. Fluorescent: 60–100 lm/W. HPS: 80–140 lm/W. DLC Premium requires ≥120 lm/W for most categories.
CIE 117 glare scale (5–40). UGR <19 for offices per EN 12464-1. UGR <16 for classrooms. UGR <22 for industrial. Lower = less glare.
Lumen maintenance per IES LM-80/TM-21. L70 = 70% initial lumens remaining (typical LED rating: 50,000h). L90 = 90% remaining (premium).
North American energy efficiency qualification. Standard vs Premium tiers. DLC Premium V6.0 required for maximum utility rebates (up to 50% fixture cost).