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Vivosun 40-Cell Seedling Tray Kit - LED Light & Heat Mat

Official VIVOSUN Dealer Model: WEB-SST-1-0001
  • Controls temperatures between 32 and 122 degrees Fahrenheit with dual-display monitoring.
  • Integrated 5000K LED bars feature four brightness levels and three automatic timer settings.
  • Forty individual cells with dedicated drainage holes prevent overwatering and support root health.
  • 3-year limited warranty on lights and electronics, 1-year on consumables
  • View More Details

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THROUGH THE Cultivator's LENS Hands-On Evaluation

  • You are starting seeds indoors because your drafty windowsills prevent consistent germination and cause weak stems.
  • You are consolidating your equipment because managing separate heat mats and light timers creates unnecessary cable clutter.

  • The dome handle is a smart addition because it saves you from struggling with wet, slippery plastic edges.
  • We like how the LED bars are integrated into the lid, as it keeps the light close without needing extra hangers.

  • Buyers who struggled with inconsistent temperatures report that the dual-display controller removed all the guesswork.
  • Users who switch between indoor cycles say the built-in timer prevents them from ever forgetting a light cycle.

Vivosun 40-Cell Seedling Tray Kit - LED Light & Heat Mat

Seeds 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.

The 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.

Underneath, 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.

Features

🫙
3.6″ Vented Humidity Dome

Tall clear dome with two adjustable vents, a lift handle, and snap-fit edges.

💡
5000K LED Light Bars

Embedded LED bars with four dimming levels from 25% to 100% brightness.

⏱️
3 Built-In Timer Cycles

Set lights to run 8, 12, or 18 hours on, then shut off automatically.

🌡️
Dual-Display Controller

Shows real and set temperature side by side, adjustable from 32–122°F.

🛡️
IP67 Waterproof Heat Mat

10″ × 20.75″ mat with a waterproof surface that stands up to spills and splashes.

🌱
40 Drainage Cells

Every cell drains into a black base tray to prevent overwatering and protect roots.

What's Included

  • 1x Humidity Dome
  • 1x 40-Cell Seed Tray
  • 1x Base Tray
  • 1x LED Lamp Set (with inline controller and power adapter)
  • 1x Seedling Heat Mat (10″ × 20.75″)
  • 1x Temperature Controller
  • 10x Garden Labels
  • 1x Garden Tool Kit

Specifications

Specification Value
Assembled Tray Dimensions 15.2″ × 10.1″ × 5.6″
Humidity Dome 15.2″ × 10.1″ × 3.6″, 2 adjustable vents
Seed Tray 40 cells, 14.0″ × 8.9″ × 2.0″, drainage hole in each cell
Base Tray 14.7″ × 9.7″ × 2.3″
Tray Material PET, PP
LED Color Temperature 5000K
LED Power 12W
LED Input Voltage 12V
LED Dimming 4 levels (25%, 50%, 75%, 100%)
LED Timer 8H on / 16H off, 12H on / 12H off, 18H on / 6H off
LED Bar Dimensions 12.2″ × 0.6″ × 0.3″
LED Certification UL
Heat Mat Size 10″ × 20.75″
Heat Mat Surface IP67 waterproof
Temperature Controller Range 32–122°F (0–50°C)
Controller Display Dual digital (real temperature and set temperature)
Compatible Media Soil, rockwool cubes

Frequently Asked Questions

What comes in the Vivosun 40-Cell Seed Starter Kit? +

The 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.

How do I set the LED timer and brightness? +

Use 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.

How does the heat mat temperature controller work? +

Set 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.

Is the heat mat waterproof? +

Yes. 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.

How do I control humidity inside the dome? +

Rotate 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.

Can I use soil or rockwool in the cells? +

Yes. 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.

How much room do seedlings have under the dome? +

The 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.

How do I transplant seedlings from the tray? +

Once 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.

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