Full-Spectrum LED

Full-spectrum LED has become the dominant cannabis grow light category as the technology matured between 2018-2024, replacing the earlier "blurple" (red+blue only) LED designs that dominated from 2010-2017. The technology: full-spectrum LEDs combine multiple chip types to produce light across the entire visible spectrum plus optional UV and far-red. Standard full-spectrum LED chip composition: White phosphor LEDs (3000K to 5000K Kelvin temperature) provide broad-spectrum coverage including green and yellow wavelengths that earlier "blurple" designs lacked; Royal blue chips (440-460nm) supplement vegetative growth and chlorophyll-A absorption; Deep red chips (660-680nm) supplement flowering and chlorophyll-B absorption; Optional UV-A chips (385-400nm) boost terpene production and trichome density; Optional far-red chips (730-740nm) enhance flowering and stretch control. The visible color of full-spectrum LED fixtures is typically pink-magenta (the combination of white + supplemental red) rather than the blue-purple of older "blurple" designs. Quality indicators for full-spectrum LEDs: PAR efficiency of 2.5-3.0 µmol/J (modern commercial standard); even canopy coverage with PPFD variance under 20% across the lit area; high CRI (Color Rendering Index) of 90+ for accurate plant color appearance during inspection; quality LED chips from Samsung (LM301B, LM301H), Osram, Lumileds; quality drivers from Mean Well, Inventronics, OSRAM; aluminum heat sinks with passive cooling sufficient for 50,000+ hour operation. Major full-spectrum LED brands: Premium tier — Fluence Spydr, Gavita Pro 1700e, ChilLED Growcraft X2, California Lightworks Solar System; Mid-tier — HLG (Horticulture Lighting Group), Spider Farmer SF-series, Mars Hydro FC-series; Budget tier — VIPARSPECTRA, Spider Farmer SE-series, Mars Hydro TS-series. Modern full-spectrum LEDs perform vegetative and flowering with the same fixture (no bulb swap or fixture change needed), match or exceed HPS yields per square foot, consume 30-50% less electricity than equivalent HPS, produce dramatically less heat reducing cooling requirements, last 50,000+ hours (vs HPS 10,000-15,000 hours), and offer dimmability for fine control over plant response. Full-spectrum LED is the recommended choice for virtually all new indoor cannabis cultivation projects.