Room · task · budget
Use four selection inputs to compare families without confusing high efficacy with a complete lighting outcome.
This worksheet is a discussion aid, not a photometric calculator. Entering a target does not prove maintained illuminance; room geometry, reflectance, depreciation and distribution still require project calculation.
Match beam angle and candela pattern to mounting distance and target size.
Review shielding, luminance, common sightlines and UGR context.
Choose CCT, CRI and available TM-30 information for materials and skin tones.
Confirm dimming range, protocol, zoning, sensor behavior and service access.
Context: screens and collaborative tables share one ceiling. Method: compare wide direct distribution, vertical light and daylight-linked control. Decision: protect screen comfort and task visibility before chasing maximum lm/W.
Context: displays change by season. Method: model aiming points, beam spread, CRI and TM-30 data. Decision: retain adjustment while setting glare limits from customer sightlines.
Context: low ambient levels must still support orientation. Method: test vertical illumination, warm CCT and emergency requirements. Decision: separate atmosphere from mandatory life-safety design.
Higher efficacy may reduce source size or color-quality options; tighter beams increase aiming sensitivity; integrated drivers simplify form but can complicate component replacement. DALI-2 offers addressed control and diagnostics where supported, while 0-10V may suit simpler analog zoning; neither protocol is automatically the lower-cost choice after wiring and commissioning are counted.
Share room dimensions, target surfaces, controls intent and the two options you need to distinguish.