{"product_id":"vivosun-40-cell-seedling-tray-kit-led-light-heat-mat","title":"Vivosun 40-Cell Seedling Tray Kit - LED Light \u0026 Heat Mat","description":"\u003ch4\u003e\u003cbr\u003e\u003c\/h4\u003e\n\u003ch2\u003eVivosun 40-Cell Seedling Tray Kit - LED Light \u0026amp; Heat Mat\u003c\/h2\u003e\n\u003cdiv\u003e\n\u003cp\u003eSeeds started on a cold windowsill often germinate slowly and unevenly, then stretch toward the glass looking for light. The Vivosun 40-Cell Seed Starter Kit controls the three conditions seedlings need most: warmth, humidity, and light. It combines a vented 40-cell propagation tray, two dimmable 5000K LED light bars with a built-in timer, and a 10″ × 20.75″ IP67 waterproof heat mat with a dual-display temperature controller.\u003c\/p\u003e\n\u003cp\u003eThe clear 3.6″ humidity dome gives seedlings room to grow while holding in moisture. Two adjustable vents let you fine-tune humidity and airflow as plants develop. The LED light bars sit in the dome's top, and their inline controller offers four brightness levels (25%, 50%, 75%, 100%) and three timer cycles (8, 12, or 18 hours on). A center handle makes the dome easy to lift, and a snap fit keeps it seated on the tray.\u003c\/p\u003e\n\u003cp\u003eUnderneath, the temperature controller shows the heat mat's real-time temperature alongside your set point, with a range of 32–122°F (0–50°C). The 40-cell PET and PP seed tray has drainage holes in every cell and nests into a black base tray that supports root development. Fill the cells with soil or rockwool cubes, mark rows with the 10 included garden labels, and use the included tool kit to transplant seedlings when they're ready.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eFeatures\u003c\/h4\u003e\n\u003cstyle\u003e\n  .image-gallery-container{max-width:1240px;margin:20px auto;}\n  .image-gallery{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem;}\n  .gallery-item{aspect-ratio:1;overflow:hidden;border-radius:8px;}\n  .gallery-item img{width:100%;height:100%;object-fit:cover;display:block;transition:transform 0.3s ease;}\n  .gallery-item:hover img{transform:scale(1.05);}\n  @media (max-width:768px){\n    .image-gallery{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;gap:0.75rem;}\n    .gallery-item{flex:0 0 85%;scroll-snap-align:center;}\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"image-gallery-container\"\u003e\n\u003cdiv class=\"image-gallery\"\u003e\n\u003cdiv class=\"gallery-item\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1383\/1731\/files\/Vivosun_40-Cell_Seedling_Tray_Kit_7.jpg?v=1790626647\" alt=\"Vivosun 40-cell seed tray with drainage holes and black base tray\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"gallery-item\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1383\/1731\/files\/Vivosun_40-Cell_Seedling_Tray_Kit_6.jpg?v=1790626647\" alt=\"Vivosun 3.6 inch humidity dome with two adjustable air vents\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"gallery-item\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1383\/1731\/files\/Vivosun_40-Cell_Seedling_Tray_Kit_4.jpg?v=1790626647\" alt=\"Vivosun IP67 waterproof seedling heat mat with dual digital display temperature controller\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"gallery-item\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1383\/1731\/files\/Vivosun_40-Cell_Seedling_Tray_Kit_5.jpg?v=1790626647\" alt=\"Vivosun seed starter dome with embedded LED lamps, lift handle and snap design\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cstyle\u003e\n  .features-grid-container{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;padding:2rem 0;font-family:'Helvetica Neue',Helvetica,Arial,sans-serif;margin:0 auto;max-width:1240px;}\n  .feature-card{background-color:transparent;padding:1.5rem;border-radius:8px;text-align:center;flex:0 1 240px;box-sizing:border-box;}\n\u003c\/style\u003e\n\u003cdiv class=\"features-grid-container\"\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e🫙\u003c\/span\u003e\n\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003e3.6″ Vented Humidity Dome\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eTall clear dome with two adjustable vents, a lift handle, and snap-fit edges.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e💡\u003c\/span\u003e\n\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003e5000K LED Light Bars\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eEmbedded LED bars with four dimming levels from 25% to 100% brightness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e⏱️\u003c\/span\u003e\n\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003e3 Built-In Timer Cycles\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eSet lights to run 8, 12, or 18 hours on, then shut off automatically.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e🌡️\u003c\/span\u003e\n\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003eDual-Display Controller\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eShows real and set temperature side by side, adjustable from 32–122°F.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e🛡️\u003c\/span\u003e\n\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003eIP67 Waterproof Heat Mat\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003e10″ × 20.75″ mat with a waterproof surface that stands up to spills and splashes.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"feature-card\"\u003e\n\u003cspan style=\"font-size: 2.5em; line-height: 1; color: #2c5530;\"\u003e🌱\u003c\/span\u003e\n\u003ch5 style=\"font-size: 1.1em; font-weight: bold; color: #333; margin: 0.75rem 0 0.5rem 0;\"\u003e40 Drainage Cells\u003c\/h5\u003e\n\u003cp style=\"font-size: 0.95em; line-height: 1.6; color: #555; margin: 0;\"\u003eEvery cell drains into a black base tray to prevent overwatering and protect roots.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1x Humidity Dome\u003c\/li\u003e\n\u003cli\u003e1x 40-Cell Seed Tray\u003c\/li\u003e\n\u003cli\u003e1x Base Tray\u003c\/li\u003e\n\u003cli\u003e1x LED Lamp Set (with inline controller and power adapter)\u003c\/li\u003e\n\u003cli\u003e1x Seedling Heat Mat (10″ × 20.75″)\u003c\/li\u003e\n\u003cli\u003e1x Temperature Controller\u003c\/li\u003e\n\u003cli\u003e10x Garden Labels\u003c\/li\u003e\n\u003cli\u003e1x Garden Tool Kit\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4 style=\"margin-bottom: 0;\"\u003eSpecifications\u003c\/h4\u003e\n\u003cstyle\u003e.styled-spec-container{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid #eee;border-radius:8px;margin-bottom:1em;}.styled-spec-table{width:100%;border-collapse:collapse;}.styled-spec-table thead{background-color:#f8f8f8;}.styled-spec-table th,.styled-spec-table td{padding:12px 15px;text-align:left;vertical-align:top;}.styled-spec-table th{font-weight:bold;color:#333;border-bottom:2px solid #ccc;}.styled-spec-table td{border-bottom:1px solid #eee;}.styled-spec-table tbody td:first-child{font-weight:500;color:#444;}.styled-spec-table tbody tr:last-child td{border-bottom:none;}\u003c\/style\u003e\n\u003cdiv class=\"styled-spec-container\"\u003e\n\u003ctable class=\"styled-spec-table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eAssembled Tray Dimensions\u003c\/td\u003e\n\u003ctd\u003e15.2″ × 10.1″ × 5.6″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHumidity Dome\u003c\/td\u003e\n\u003ctd\u003e15.2″ × 10.1″ × 3.6″, 2 adjustable vents\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeed Tray\u003c\/td\u003e\n\u003ctd\u003e40 cells, 14.0″ × 8.9″ × 2.0″, drainage hole in each cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase Tray\u003c\/td\u003e\n\u003ctd\u003e14.7″ × 9.7″ × 2.3″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTray Material\u003c\/td\u003e\n\u003ctd\u003ePET, PP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Color Temperature\u003c\/td\u003e\n\u003ctd\u003e5000K\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Power\u003c\/td\u003e\n\u003ctd\u003e12W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Input Voltage\u003c\/td\u003e\n\u003ctd\u003e12V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Dimming\u003c\/td\u003e\n\u003ctd\u003e4 levels (25%, 50%, 75%, 100%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Timer\u003c\/td\u003e\n\u003ctd\u003e8H on \/ 16H off, 12H on \/ 12H off, 18H on \/ 6H off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Bar Dimensions\u003c\/td\u003e\n\u003ctd\u003e12.2″ × 0.6″ × 0.3″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLED Certification\u003c\/td\u003e\n\u003ctd\u003eUL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Mat Size\u003c\/td\u003e\n\u003ctd\u003e10″ × 20.75″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat Mat Surface\u003c\/td\u003e\n\u003ctd\u003eIP67 waterproof\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTemperature Controller Range\u003c\/td\u003e\n\u003ctd\u003e32–122°F (0–50°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eController Display\u003c\/td\u003e\n\u003ctd\u003eDual digital (real temperature and set temperature)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible Media\u003c\/td\u003e\n\u003ctd\u003eSoil, rockwool cubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\u003cdiv class=\"faq-container\"\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eWhat comes in the Vivosun 40-Cell Seed Starter Kit?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe kit includes a humidity dome, a 40-cell seed tray, a base tray, an LED lamp set with inline controller and power adapter, and a 10″ × 20.75″ seedling heat mat with a temperature controller. You also get 10 garden labels and a garden tool kit for sowing and transplanting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eHow do I set the LED timer and brightness?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eUse the inline LED controller to pick one of three timer cycles: 8 hours on \/ 16 off, 12 on \/ 12 off, or 18 on \/ 6 off. The brightness button steps through four levels (25%, 50%, 75%, and 100%) so you can match light intensity to your seedlings' stage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eHow does the heat mat temperature controller work?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eSet your target temperature with the + and − buttons anywhere from 32–122°F (0–50°C). The dual digital display shows the mat's real-time temperature on top and your set temperature below, so you can confirm it's holding steady.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eIs the heat mat waterproof?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eYes. The seedling heat mat has an IP67-rated waterproof surface, so spills and overflow from watering won't damage it. Keep the controller and power connections dry.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eHow do I control humidity inside the dome?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eRotate the two green vents on top of the dome to open or close them. Keep them mostly closed for high humidity during germination, then open them gradually as seedlings develop to increase airflow and help them harden off.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eCan I use soil or rockwool in the cells?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eYes. The 40 cells work with seed-starting soil or rockwool cubes. Each cell has a drainage hole that lets excess water collect in the base tray instead of saturating the roots.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eHow much room do seedlings have under the dome?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe humidity dome stands 3.6″ tall, giving seedlings extra headroom to grow before you need to remove the cover. That space helps them develop sturdier stems instead of crowding against the lid.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cdiv class=\"faq-question\"\u003e\n\u003cspan\u003eHow do I transplant seedlings from the tray?\u003c\/span\u003e \u003cspan class=\"faq-icon\"\u003e+\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-answer\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eOnce seedlings are established, use the included garden tools to lift each one out of its cell with the root ball intact, then move it into a pot or your garden. The garden labels help you keep varieties organized through the move.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"VIVOSUN","offers":[{"title":"Default Title","offer_id":52574945542360,"sku":"WEB-SST-1-0001","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1383\/1731\/files\/Vivosun_40-Cell_Seedling_Tray_Kit_1.png?v=1790626647","url":"https:\/\/trimleaf.com\/products\/vivosun-40-cell-seedling-tray-kit-led-light-heat-mat","provider":"Trimleaf","version":"1.0","type":"link"}