| 1 | Product range and fit | Common office panel formats include 600 × 600 mm and 600 × 1200 mm; regional nominal sizes also vary. | Check dimensions, mounting options, thickness, cut-out requirements, driver location, and compatibility with existing ceilings. | Compare the exact model and installation drawing. |
| 2 | Luminous efficacy | Many commercial indoor LED panels are offered around 100–150 lm/W; efficacy varies with output, CCT, optics, and driver. | Request measured system efficacy for the complete luminaire, not just the LED package, and compare products at similar output and CCT. | Record tested lm/W and test conditions. |
| 3 | Glare and lighting quality | UGR below 19 is a common design target for some office applications, but UGR depends on the room layout and viewing conditions. | Ask for a photometric file and a UGR calculation for the intended room; do not treat a fixture-only UGR claim as a guarantee. | Review the project-specific lighting calculation. |
| 4 | Color rendering | CRI (Ra) of 80 or higher is a common baseline for general office lighting; some applications require higher color fidelity. | Check the declared CRI and, where relevant, R9 or other color-quality data from a test report for the quoted model. | Match color requirements to the application. |
| 5 | CCT and controls | Common white-light options include 3000 K, 4000 K, 5000 K, and 6500 K; dimming and tunable-white options are model-dependent. | Confirm CCT tolerance, dimming protocol, driver compatibility, control wiring, and whether the quoted configuration includes a driver. | Confirm the complete control-system specification. |
| 6 | Lifetime and warranty | Commercial products may carry multi-year warranties and stated lifetime projections; neither is universal across suppliers or models. | Request written warranty terms and supporting LED maintenance data. Check whether lifetime projections use LM-80 data and TM-21 methodology. | Compare exclusions, coverage period, and evidence. |
| 7 | Electrical performance | Input voltage, power factor, surge protection, and flicker performance depend on the driver and target market. | Verify rated input range, frequency, power factor, inrush current, surge protection, and test data against applicable project or market requirements. | Check the driver datasheet and test reports. |
| 8 | Safety and market compliance | Required approvals differ by destination and product configuration; a certificate for one model or market may not cover another. | Verify applicable safety, electromagnetic compatibility, and material-restriction documentation with the issuing body or certification database. | Match certificates to the exact model and sales market. |
| 9 | Quality and production control | Quality-system certificates can support supplier screening but do not by themselves establish product performance. | Ask about incoming inspection, production testing, traceability, change control, defect handling, and audit availability. Verify certificate scope and validity. | Assess documented processes and sample consistency. |
| 10 | Commercial and supply capability | MOQ, lead time, sample fees, packaging, payment terms, and shipping arrangements vary by order and configuration. | Request a written quotation covering the exact specification, order quantity, delivery schedule, packaging, spare parts, and after-sales process. | Compare total landed cost and delivery risk. |