Lux Level

Lux (lx) is the SI unit of illuminance. The amount of light falling on a surface per unit area. Lighting design standards specify target lux levels by task type: 300–500 lux at the workplane for general office work, 750 lux for technical drawing areas, 50–100 lux for circulation and breakout spaces. CIBSE LG7 and IS 3646 Part 1 are the primary references used in Indian office projects.

Achieving the right lux level is only part of the specification. Uniformity ratio, glare control (UGR below 19 for display screen tasks), and colour rendering index (CRI 80+) are equally important. In a 12,000 sq ft open-plan floor in Baner, a well-calibrated DALI lighting system running at 350 lux with occupancy dimming can cut lighting energy use by 40% versus a fixed-output fitting layout.

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