Seed Starter Trays with Built-In LED Lights

$59.99

Kit 5 trays, 12 cells + 5 lights 2 trays, 12 cells + 2 lights 3 trays, 12 cells + 3 lights 3 trays, 6 cells + 3 lights 2 trays, 6 cells + 2 lights

Quantity

Small seed trays with the LED built into the vent cap, powered over USB.

The clever part here is where the light sits. Instead of a separate lamp on a stand, the LED ring is set into the vent cap on top of the dome, pointing down at the seedlings from a few inches away.

That makes the whole thing self-contained. A tray goes anywhere with a USB socket — a shelf, a desk, a spare corner — without needing a windowsill at all.

They are small on purpose. Two or three of these is the right scale for a few pots of herbs, some chillies and a tray of salad, rather than a whole vegetable plot.

Fill the cells with damp seed compost and sow at the depth on the packet.
Fit the dome and turn the vent cap closed while the seeds germinate.
Plug the USB lead into a charger or powered hub. On the multi-tray kits, each tray runs off the same hub.
Open the vent as soon as seedlings appear, and open it further as they grow.
Water sparingly. At this size the compost dries slowly under a dome.
Lift the dome off once the seedlings reach it, and pot them on at the first true leaves.

Tray footprint: about 7.3 x 5.7 in (185 x 145 mm)
6-cell version: cells about 2.1 x 1.9 in — bigger cells, fewer of them
12-cell version: cells about 1.5 x 1.5 in
Light: LED ring built into the vent cap, one per tray, USB powered
Dome: clear, with a twist vent
Drainage: a hole in the base of each cell, over a solid outer tray
Material: clear plastic, listed by the supplier as PET

There is no built-in timer, so use a plug timer if you want a fixed day length. The light colour can vary between batches. Compost and seeds are not included.

Two questions. First, cell size: 6 cells gives fewer but roomier cells, better for things you want to keep in the tray a little longer, such as squash or beans. 12 cells packs in twice as many small ones, which suits herbs, salad and anything you pot on quickly.

Second, how many. Every kit includes one LED cap per tray and a USB hub to run them together. Twelve-cell trays come in kits of two, three or five; six-cell trays in kits of two or three.

There is no timer built in. A cheap plug or USB timer solves it.
Cells this small dry out fast once the dome is off. Watch them daily at that stage.
Open the vent once seedlings show, or the damp still air under the dome invites mould.
The purple LED light is unflattering in a living room. Worth knowing before it sits on a shelf all spring.

Do all the options come with lights?

Yes. Every kit includes one LED cap per tray plus a USB hub.

6 cells or 12?

Twelve small cells for herbs and salad, six larger ones for seedlings that stay in the tray longer. The tray footprint is the same either way.

Is there a timer?

Not built in. Add a plug timer if you want a consistent day length, which seedlings do prefer.

What colour is the light?

The light colour can vary between production batches, so the one you receive may differ from the photos.

Can I reuse them?

Yes. Wash and dry them at the end of the season and stack them for storage.

Why you'll love it

The light is in the lid. No lamp, no stand, nothing to clip on.

Runs off USB. A phone charger is enough, so it can live anywhere.

Eight ways to buy it. Two, three or five trays, six or twelve cells, with lights or without.

When to stop using the dome

A dome is useful for exactly one stage: from sowing until the seedlings are up. It holds moisture around the surface so the compost does not dry out and stall germination halfway through.

After that it becomes a liability. Warm, still, saturated air over damp compost is the exact condition for damping-off, the fungal problem that makes a seedling collapse at the base overnight, looking pinched as if something bit through it. Once it starts in a tray it spreads.

So the routine is: vent closed until the first shoots break through, vent open the same day, dome off entirely within a week or so. Air movement matters more than most people expect.

A quick guide for your growing space

Warmth

Seeds germinate within a temperature range rather than at one magic number, and a cold windowsill in February is often the whole reason nothing comes up. Somewhere that stays at normal room temperature is usually enough.

Humidity

A clear dome holds moisture around seedlings while they root, but still, damp air is also how mould gets started. Open the vent once the seedlings are up, and let the surface dry a little between waterings.

Short days

Winter is when a grow light earns its keep. Put it on a timer and give a consistent day length rather than leaving it on around the clock, because plants use the dark hours too.

Small spaces

Growing indoors is mostly a question of surface. A tray on a shelf, a light clipped over one pot, or a tower that stacks upward all trade floor space for height.