Use this actionable checklist:
Do they have real case studies with live photos?
Can they explain UGR, optics, IES files, and lighting policies?
Does the product have UL/ETL/DLC/CE certification documents?
Can they retrofit fixtures or produce OEM/ODM solutions?
Can they provide IES files for each building component?
Do they deliver large orders on time?
Do they offer warranty and spare parts?
Can they support both small and large projects?
This list can immediately exclude low-quality or inexperienced suppliers.