{"product_id":"sayhon-sh4000-led-grow-light-dimmable-full-spectrum-w-uv-ir-bar-for-5x6-tent-high-efficacy-2-7-µmol-j","title":"SAYHON SH4000 LED Grow Light — Dimmable Full Spectrum w\/ UV \u0026 IR Bar for 5x6 Tent, High Efficacy 2.7 µmol\/J","description":"\u003cp\u003e\u003cstrong\u003eThe SAYHON 2026 Upgraded SH4000 is a dimmable full-spectrum LED grow light with a separate UV \u0026amp; IR supplement bar designed to maximize indoor plant yield and crop quality in a 5'x6' tent.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you grow indoors—whether hobbyist houseplants, a 5'x6' tent, or a small greenhouse—the SH4000 combines high photon efficiency, adjustable intensity, and targeted UV\/IR wavelengths to support all growth stages from seedling to harvest. The unit uses the latest diodes and an advanced aluminum heat sink to keep light output stable over years, while a plug-and-play, fanless design keeps operation silent and simple.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the SH4000 improve plant growth across different stages?\u003c\/h3\u003e\n\u003cp\u003eThe SH4000 provides a broad 400–760nm spectrum with concentrated deep red 660nm, warm 2700K and natural 5000K whites to suit vegetative and flowering phases. The separate UV \u0026amp; IR bar adds UVA (390nm) and IR (730nm), which can influence plant morphology and flowering responses without manual spectrum swapping.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFull spectrum mainboard covers seedling through flowering with even PAR distribution.\u003c\/li\u003e\n  \u003cli\u003eDeep red 660nm supports flowering and fruiting intensity.\u003c\/li\u003e\n  \u003cli\u003e2700K and 5000K whites balance vegetative development and overall plant health.\u003c\/li\u003e\n  \u003cli\u003eSwitchable UV\/IR bar provides targeted spectral boosts when needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat energy performance and coverage can I expect from this fixture?\u003c\/h3\u003e\n\u003cp\u003eThe SH4000 delivers up to 2.7 µmol\/J, a high efficacy rating that increases usable photons per watt compared with older lights. It’s engineered to cover about a 5'x5' vegetative footprint and a 4'x4' flowering area, making it suitable for most 5'x6' tent setups when positioned correctly.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHigh efficacy: 2.7 µmol\/J for efficient electricity-to-PAR conversion.\u003c\/li\u003e\n  \u003cli\u003eCoverage: recommended 5'x5' for veg, 4'x4' for flowering inside a 5'x6' tent.\u003c\/li\u003e\n  \u003cli\u003eDimming: 5%–100% adjustable intensity to match light schedules and growth stages.\u003c\/li\u003e\n  \u003cli\u003eAC 100–277V compatibility for common residential and commercial circuits.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the SH4000 manage heat and longevity without noisy fans?\u003c\/h3\u003e\n\u003cp\u003eSAYHON designed the SH4000 with a heavy-duty aluminum heat sink rated at 3A+ coverage to dissipate heat passively, lowering operating temperatures significantly versus many competing fixtures. The fanless, silent architecture prevents dust intake and mechanical failure points, supporting long-term brightness retention.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAluminum heat sink reduces temperature more than conventional designs.\u003c\/li\u003e\n  \u003cli\u003eFanless operation ensures zero noise and less maintenance.\u003c\/li\u003e\n  \u003cli\u003eMaintains over 95% brightness after extended use according to thermal design goals.\u003c\/li\u003e\n  \u003cli\u003ePlug-and-play setup needs no complex installation tools.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do the dimming and the UV\/IR module work in everyday use?\u003c\/h3\u003e\n\u003cp\u003eThe dimming control lets you fine-tune intensity from 5% to 100% to match seedlings, vegetative growth, or intense bloom lighting without changing fixtures. The UV \u0026amp; IR supplement bar includes its own switch so you can enable UVA and IR exposure only when you want to influence plant morphology or photoperiod-related cues.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDimming range 5%–100% adjusts light levels for every growth phase.\u003c\/li\u003e\n  \u003cli\u003eSeparate UV\/IR switch gives selective control over supplemental wavelengths.\u003c\/li\u003e\n  \u003cli\u003eNote: the dimmer does not function as an on\/off power switch.\u003c\/li\u003e\n  \u003cli\u003eSimple corded power and hanging hardware for quick setup.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The SAYHON SH4000 2026 is aimed at serious hobbyists and small commercial growers who need high photon efficiency, spectrum flexibility, and silent operation for a 5'x6' growing space. It fits users who want plug-and-play simplicity, low maintenance, and a long-lasting light source with targeted UV and IR options for fine-tuning crop characteristics.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the UV and IR bar be switched on separately?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, the SH4000 includes a separate switch for the UV \u0026amp; IR supplement bar to enable those wavelengths independently.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What size tent does this light cover for flowering?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: For flowering, the SH4000 is recommended for roughly a 4'x4' area and vegetative coverage up to 5'x5' inside a 5'x6' tent.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SAYHON","offers":[{"title":"Default Title","offer_id":56806206439764,"sku":"B08HCN6972","price":367.64,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/sayhon-sh4000-front-view.jpg?v=1786814188","url":"https:\/\/gardenluxe.co.uk\/products\/sayhon-sh4000-led-grow-light-dimmable-full-spectrum-w-uv-ir-bar-for-5x6-tent-high-efficacy-2-7-%c2%b5mol-j","provider":"Gardenluxe Uk","version":"1.0","type":"link"}