After burn-in, a comprehensive verification is performed to guarantee that the light meets its specifications. A spectrometer or integrating sphere measures the absolute PPF (μmol/s) and the spectral distribution. The measured value should be within ±5% of the design target. For multi-channel lights, each channel's intensity is tested independently at different PWM duty cycles. Additionally, a goniophotometer plots the far-field beam angle to confirm the intended pattern – for example, a 60° lens should show a full-width half-maximum (FWHM) of 58°–62°.
Safety and compliance tests are also carried out: dielectric strength (hipot) testing ensures that no current leaks from the internal circuit to the housing, and ground continuity is checked. Finally, the fixture is labeled with its serial number, production date, and key electrical ratings. A real-world example: a manufacturer shipping 500 units to a commercial vertical farm performs a 100% burn-in for 30 minutes, then a 5% sample goes through the full optical and electrical verification. Any failed unit is reworked or scrapped. This final stage closes the quality loop, turning a collection of components into a trustworthy, high-performance plant lighting system ready for installation.
