{"product_id":"vivosun-vs4000-led-grow-light-with-full-spectrum-diodes-dimmable-4x4","title":"VIVOSUN VS4000 LED Grow Light with Full Spectrum Diodes - Dimmable 4x4","description":"\u003cp\u003eIn this review the VIVOSUN VS4000 LED grow light is presented as a solid midrange option for growers who need strong, efficient output without excess heat or noise. The bottom line: it is best for hobbyists and small-scale growers using a 4x4 to 5x5 grow tent who want a reliable full-spectrum fixture that can be dimmed across stages. The VS4000 stands out for delivering high PAR output at a claimed 2.9 mol\/J efficiency while consuming 400W, and its low ambient heat and quiet operation make it easy to place close to plants.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull-spectrum diodes:\u003c\/strong\u003e Provides balanced sunlike light that supports photosynthesis from seedling through bloom stages.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh energy efficiency:\u003c\/strong\u003e Engineered to produce strong output at a rated 2.9 mol\/J so it uses electricity efficiently for the light it delivers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e400W power draw:\u003c\/strong\u003e Offers extremely high output while keeping wattage at 400W, suitable for tight tent setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimmable control:\u003c\/strong\u003e A built-in dimming knob and ballast let growers dial output from 25% to 100% for different growth stages and light schedules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow heat and noise:\u003c\/strong\u003e Passive ventilation and a brand driver eliminate the need for noisy fans and reduce heat stress on plants.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccessories and warranty:\u003c\/strong\u003e Ships with US-patented rope hangers and a 5-year after-sales service for long-term use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThe VIVOSUN VS4000 is aimed at hobby growers and small commercial users running a 4x4ft or up to a 5x5ft tent who want a simple, efficient full-spectrum fixture with adjustable output. Its dimmer makes it flexible for growers who run mixed cycles or need to reduce intensity for seedlings and veg without changing fixtures.\u003c\/p\u003e\n\u003cp\u003eIt is less ideal for ultra-large commercial rooms where modular fixtures or higher total canopy coverage are required, and growers who need integrated wireless controllers or decorative lighting features should look elsewhere.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eStrong, consistent light quality that supports plant growth across stages with a true full-spectrum output.\u003c\/li\u003e\n\u003cli\u003eEnergy efficient delivery at a high output relative to a 400W draw, which helps lower operating costs.\u003c\/li\u003e\n\u003cli\u003eLow ambient heat and no fan noise thanks to passive ventilation and a quality driver, allowing closer placement to plants.\u003c\/li\u003e\n\u003cli\u003eSimple dimming control and included rope hangers make setup and tuning straightforward.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users report mixed impressions about long-term durability, so expect typical wear over extended heavy use.\u003c\/li\u003e\n\u003cli\u003eNot aimed at very large commercial canopies where multiple fixtures or higher total wattage would be needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eVIVOSUN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower Consumption\u003c\/td\u003e\n\u003ctd\u003e400W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEfficiency\u003c\/td\u003e\n\u003ctd\u003e2.9 mol\/J (claimed)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoverage Area\u003c\/td\u003e\n\u003ctd\u003e4x4 ft (up to 5x5 ft max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDimming Range\u003c\/td\u003e\n\u003ctd\u003e25% to 100% with knob and ballast\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCooling\u003c\/td\u003e\n\u003ctd\u003ePassive ventilation, no fans\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty \u0026amp; Accessories\u003c\/td\u003e\n\u003ctd\u003e5-year after-sales service; US-patented rope hangers included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe VS4000 is a practical, value-oriented choice for growers who need high output and full-spectrum coverage in a 4x4 to 5x5 tent with minimal heat and noise. Its dimmable control and efficient performance make it a good buy for hobbyists and small-scale operators who want predictable plant response and lower running costs.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eCan this cover a 5x5 ft tent?\u003c\/strong\u003e\u003cbr\u003eThe manufacturer states a 4x4 ft optimal coverage and up to 5x5 ft max, so it can work at 5x5 with reduced uniformity at the edges.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it get hot enough to burn plants?\u003c\/strong\u003e\u003cbr\u003eNo, passive ventilation and low ambient heat mean it runs cool compared with fan-cooled fixtures, reducing the risk of burns when properly spaced.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the brightness adjustable for seedlings?\u003c\/strong\u003e\u003cbr\u003eYes, the integrated dimming knob lets you reduce output to 25% for seedlings and increase to 100% for bloom.\u003c\/p\u003e","brand":"VIVOSUN","offers":[{"title":"Default Title","offer_id":48617736831195,"sku":"B08GPTLSZH","price":359.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71Xm7mye7jL._AC_SL1500.jpg?v=1778450232","url":"https:\/\/gearmusthave.com\/products\/vivosun-vs4000-led-grow-light-with-full-spectrum-diodes-dimmable-4x4","provider":"GearMustHave","version":"1.0","type":"link"}