Technical Articles & Guides
Long-form, source-referenced guides on LED lighting for plants. Every article states its figures with the conditions they were measured under, links to the primary literature or industry standards behind each claim, and keeps product references to the short sections where they are genuinely relevant. New guides are added regularly.
Grow light technology
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How to Size an LED Grow Light: PPFD, DLI and Efficacy Explained
A four-step sizing method that uses only plant-relevant units — PPF, PPFD, DLI and photosynthetic photon efficacy. Includes crop DLI reference values, a PPFD-to-DLI conversion table, and a running-cost comparison across fixture efficacies.
Published 11 September 2026 -
Does Far-Red Light Increase Plant Growth? R:FR Ratio and the Emerson Effect
Far-red sits outside the PAR waveband, so it is missing from most fixtures' headline output figure, yet plants read it. This guide separates the phytochrome signalling effect from the photochemical Emerson enhancement effect, and sets out the measured dose ranges and trade-offs.
Published 11 September 2026 -
How Long Do LED Grow Lights Last? L70, LM-80 and TM-21 Explained
LED luminaires fade rather than fail. How L70, LM-80 and TM-21 define rated life, why the standards' 6X rule caps long projections, what the horticultural industry actually reports, and how to plan replacement around PPFD depreciation rather than a marketing number.
Published 11 September 2026
About the publisher
Zhongshan City Ruixian Electronics Factory (XineLam) has 17 years of experience designing and manufacturing LED lighting, and holds 300+ patents in China and internationally. The articles on this page are written as technical reference material for growers, specifiers and researchers; they are not product brochures.