Your plants deserve more than a windowsill.
Window light≈100 PPFD
TerraSens light≈500 PPFDTerraSens is developing a light for growing plants indoors.
≈500 µmol/m²/s under the lamp
On the windowsill ≈100. These are the basil plants in the photos above. Measured at leaf height with the Photone app.
No purple glare
Typical grow lamps glow purple. This light comes from deep-red and warm-white full-spectrum LEDs.
Designed and made in Croatia
From milling to assembly, inside the European Union.
The design stays under wraps until it's protected. Followers see it first.
What is PPFD?
PPFD (photosynthetic photon flux density) measures how much of the light plants use for photosynthesis actually reaches the leaf, in µmol per m² per second.
≈500 µmol/m²/s under the lamp
On the windowsill ≈100. These are the basil plants in the photos above. Measured at leaf height with the Photone app.
No purple glare
Typical grow lamps glow purple. This light comes from deep-red and warm-white full-spectrum LEDs.
Designed and made in Croatia
From milling to assembly, inside the European Union.
Next result
02'Purple Ball' basil
First lampsQ1 2027
Both basil plants are the same cultivar and grew in identical pots, so the light is what makes the difference in the photos.
Hypothesis 01
'Red Rubin' basil only shows its deep purple under strong light. We're testing whether the selected LEDs and their arrangement in our lamp deliver enough of it, on a kitchen shelf, with no greenhouse.
Next result
02'Purple Ball' basil
First lampsQ1 2027
Grow tests · in progress
Three plants that can't hide bad light.
We picked plants that show straight away when the light is wrong. Every test result is published here.
- 01
'Red Rubin' basil
Ocimum basilicum 'Red Rubin'
Turns deep purple only with enough light. At ≈100 PPFD it stays green with purple veins; at ≈500 it goes dark.
Result published
Read result 01 → - 02Coming soonPhoto with the result
'Purple Ball' basil
Ocimum basilicum 'Purple Ball'
Grows as a tight purple globe. Under weak light it stretches, falls apart and loses its colour.
Sown 9/23/2026
Result · mid-November
- 03Coming soonPhoto with the result
'Prairie Fire' chilli
Capsicum annuum 'Prairie Fire'
Needs a lot of light to set fruit indoors. Our hardest test.
Result · December
The idea behind TerraSens
What the lamp is made of
and where it takes shape.
Our lamp is not an import with a logo stuck on it. We design and make it in Croatia, from milling to assembly, inside the European Union.
For every material in the lamp, we know what it is made of and where it comes from.
European beech, a linseed-oil finish with no solvents, milled aluminium instead of moulded plastic, organic soil and organic feed for the plants we test on.
Bill of origin
Beech
European beech
Finish
Linseed-oil based: no solvents, 0% VOC
Heatsink
Milled and anodised aluminium instead of moulded plastic, sourced in Croatia
Soil
Organic, no synthetic additives
Feed
Organic fertiliser only
Made in
Designed, machined and assembled in Croatia, EU
Standards the lamp is designed to meet
Testing is under way.
The declaration of conformity will be published before the first delivery.
- CE
- Conformity assessment before the first unit ships
- RoHS
- Electronics without restricted substances
These are the standards the design is built to. The signed declarations follow before the first lamps ship.
Grow tests
Follow every test, from seed to result.
The first lamps are planned for Q1 2027. Followers see the design first and get the result of every test: one email per test.