{"product_id":"vivosun-lumalight-400w-led-grow-light-full-spectrum-dimmable-for-4x4-ft-low-heat-quiet-operation","title":"VIVOSUN LumaLight 400W LED Grow Light — Full Spectrum, Dimmable for 4x4 ft, Low Heat Quiet Operation","description":"\u003cp\u003e\u003cstrong\u003eVIVOSUN LumaLight 400W LED Grow Light is a full-spectrum, dimmable LED designed to power indoor gardens up to 4x4 ft with efficient 2.9 μmol\/J output while running quietly and with low heat.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhether you are expanding a closet grow or upgrading a small tent, this VIVOSUN LumaLight model combines a high-efficiency LED array and an integrated driver to deliver robust light for every growth stage. It consumes 400 watts of electrical power but is engineered for strong photon output and energy-conscious performance, making it suitable for growers who want reliable intensity without excessive heat or noise.\u003c\/p\u003e\n\n\u003ch3\u003eHow bright and efficient is this light for a small grow space?\u003c\/h3\u003e\n\u003cp\u003eThe LumaLight produces an elevated photon efficiency of about 2.9 μmol\/J, yielding substantial PAR output while consuming 400W. It’s optimized to provide even coverage across a primary footprint of 4x4 ft and can stretch to 5x5 ft in some setups.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRated power: 400 watts of electrical draw\u003c\/li\u003e\n  \u003cli\u003ePhoton efficacy: ~2.9 μmol\/J for effective photosynthetic photon delivery\u003c\/li\u003e\n  \u003cli\u003eRecommended coverage: 4x4 ft (up to 5x5 ft in lower-PPFD scenarios)\u003c\/li\u003e\n  \u003cli\u003eEven light spread from a dense diode array and reflector design\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I adjust the light for seedlings through flowering?\u003c\/h3\u003e\n\u003cp\u003eYes — a built-in dimmer and ballast let you dial the output from 25% to 100%, so you can reduce intensity for clones and seedlings or increase power during vegetative and bloom phases. This makes the fixture flexible across the plant lifecycle without swapping lamps.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDimming range: 25%–100% for gradual scaling\u003c\/li\u003e\n  \u003cli\u003eSingle control knob for quick adjustments\u003c\/li\u003e\n  \u003cli\u003eSuitable for light-sensitive stages and high-demand bloom periods\u003c\/li\u003e\n  \u003cli\u003eHelps control energy use by lowering output when full power isn’t required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eDoes it run hot or require noisy cooling?\u003c\/h3\u003e\n\u003cp\u003eThe unit is engineered to operate with minimal ambient heat and no built-in fans, so it stays quiet and reduces the risk of heat stress. Internal ventilation and a quality driver manage thermal performance so you can place it closer to canopy than many traditional high-heat fixtures.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePassive cooling design keeps noise minimal\u003c\/li\u003e\n  \u003cli\u003eLower surface and ambient heat compared with HPS systems\u003c\/li\u003e\n  \u003cli\u003eAllows closer mounting distances without burning plants\u003c\/li\u003e\n  \u003cli\u003eBuilt-in driver and vents for steady thermal control\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat accessories and warranty support come with the light?\u003c\/h3\u003e\n\u003cp\u003eThe LumaLight ships with VIVOSUN’s patented rope hangers for fast, adjustable installation and includes a five-year after-sales service period for peace of mind. The rugged build is intended for long life and repeated reuse in home or small commercial grows.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIncludes a pair of VIVOSUN US-patented rope hangers\u003c\/li\u003e\n  \u003cli\u003eFive-year after-sales\/service coverage\u003c\/li\u003e\n  \u003cli\u003eDurable housing and quality driver for extended use\u003c\/li\u003e\n  \u003cli\u003ePlug-and-play setup for quick deployment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The VIVOSUN LumaLight 400W is designed for hobbyists, small-scale producers, and serious home growers who need a powerful, energy-efficient full-spectrum fixture for a 4x4 tent or similar footprint. It’s a fit if you want precise dimming, low-noise operation, and lower thermal output without sacrificing photon delivery across all plant stages.\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: What footprint does the VIVOSUN LumaLight 400W cover?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Ideally a 4x4 ft area; it can cover up to 5x5 ft at reduced PPFD intensity.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the light adjustable for different plant stages?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The built-in dimmer adjusts output from 25% to 100% for seedlings through flowering.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"VIVOSUN","offers":[{"title":"Default Title","offer_id":56801716568404,"sku":"B08GPTLSZH","price":483.02,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/vivosun-lumalight-400w-front-view.jpg?v=1786747291","url":"https:\/\/gardenluxe.co.uk\/products\/vivosun-lumalight-400w-led-grow-light-full-spectrum-dimmable-for-4x4-ft-low-heat-quiet-operation","provider":"Gardenluxe Uk","version":"1.0","type":"link"}