The latest LED and plant growth information from our specialists

How powerful is the LED Grow S250 grow light? PPFD light test

Grow Light Test Tent

LED Grow S250

Apogee MQ-610 ePAR Meter

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As we develop better led grow lights for the NZ market, we collect and analyse a ton of data. Here we share our findings with you so you can make better grow light purchase decisions.

Methodology: 1.5m2 x 2m tent used with a 1m x 1m grid of 10cm squares, tested at a variety of heights: 450, 600 and 1200mm

Testing Meter:  Apogee MQ-610 ePAR meter

Spectrum tested: Visible light + 380 to 760 nm (Includes UV & IR)

2.66umol/j Efficiency Rating

665µmol m-2 s-1 average on the 1m² test area means that this light achieves an efficiency rating of 2.66. This is the highest rating of all lights tested so far.

Average PPFD for 600mm x 600mm: 1586µmol m-2 s-1

Testing out the little 250watt S250 in a 1.5m² grow tent is cruel, but this light showed that when hung up close to plants it can still pack an impressive punch. Flowering footprint 600x600mm at 1586µmol m-2 s-1 means maximum fruit or flower production in a 600×600 area.

Average PPFD at 150mm: 665µmol m-2 s-1

Average PPFD at 600mm: 370µmol m-2 s-1


Average PPFD at 450mm: 429µmol m-2 s-1

Average PPFD at 1200mm: 201µmol m-2 s-1


From Seedling to Flower or Fruit

The S250 is only uses 250W of power. In spite of the low power draw, this light can still be used for small seedlings on a low setting. For big flowering or fruiting plants, hang the S250 up close and give your plants an impressive 1586µmol!

A perfect LED Grow light for seedlings
When hanging the light at 1200mm (average PPFD of 201µmol m-2 s-1) 

You are giving your small seedlings or cuttings the perfect amount of light.

Too much light? Easy, just turn the dimmers down and then gradually increase as your plants demand more light.

Hang the S250 as close as possible to your plants
To get the most out of flowering or fruiting plants you need to give the plant a lot of photons. To get the most from indoor plants, you need 1200ppfd or above.

Hanging your S250 450mm-150mm from your plants means your plants get up to 1586µmol m-2 s-1 at the centre of the light. This is what you need to get the most from your indoor Flowers or Fruit plants.