Most growers are familiar with “lumens”. The definition of the lumen is the total light produced within the range of the human visual response. It tells us nothing about the distribution of that light over the spectrum, and even more importantly, it tells us nothing about how much of that light is useful for plants.
The problem with lumens is especially pronounced when measuring light at the far ends of the human visual response curve. For example, take three lamps - a red one, a green one and a blue one - each emitting the same number of watts of optical energy. The red lamp and the blue lamp would have much lower lumen ratings compared to the green lamp, simply because the human visual response is very low at red and blue and highest at green so that is why a high lumen rating does not necessarily make a lamp better suited to growing plants.
Lux
Lux tells you how many lumens fall on each square metre of a surface. So, an illumination of 50,000 lux is 50,000 lumens falling on each square metre
Lux measurements tell you how intense your grow lamps are...this’ll help you:
Choose how far to mount your light from your plants.
Get an idea of light degradation.
However, lux still won’t tell you how useful a grow light is to your plant.
What Is PAR?
PAR, which stands for Photosynthetically Active Radiation, describes the waveband between 400 and 700 nm. This is the light that is used by plants for photosynthesis.
Thus, the focus of PAR is on light wavelengths that the plant interacts with during the process of photosynthesis.
This wave band overlaps with the visible spectrum used in lumen calculation.
Sensors used to measure PAR use one of two different weighting methods in arriving at the final value: the PPF (photosynthetic photon flux) and the YPF (yield photon flux).
Which is a better indicator for plants?
From a plant’s perspective, they require light that is useful for photosynthesis but not the one that is brighter for humans. The human eye has peak sensitivity for yellow and green wavelengths but these colors are not as effective in plant growth.
Traditional bulbs may have high light intensity, i.e lumens, but may not have high PAR or PPF values. This is one of the reasons why traditional bulbs are poor choices for indoor plant cultivation. While choosing better grow light for plants, higher value is given to wavelengths that promote plant growth and development. That means, in grow light selection, higher preference is given to PAR rating than lumen/lux value.
Fluence SPYDR 2x 33" LED Grow Light System
SPYDR 2x is an early-development top-lighting solution for commercial cultivation, or a full-cycle top-lighting solution for home hobbyists cultivating without CO2 supplementation at ambient conditions around 400 ppm. SPYDR 2x is comparable to the previous generation’s SPYDRx and delivers an average of 550 µmol/m2/s of highly-uniform light over a 4’x4’ area at only 6” above canopy.
ECO Farm 600W Dimmable LED Grow Light
The ECO Farm 600W Vertical Farming LED Grow Light takes Vertical Farming into the new era. A vertical farming LED Grow Light that is engineered to be superior and outperform all of the Vertical Farming LEDs on the market today. Fully equipped with the Latest in High End LED technology from the best of Samsung, the best of CREE & best from Meanwell.
Futur Vert Floramax FM8 LED Grow Light
- Covering all growing stages including Genetics, Propagation,Vegetation and Flowering.
- Quick connect for ease connection in series, with simple power supply and dimming control function.
- Hollow design makes it with good air fluidity and great heat dissipation.
- Giving large luminous are and uniform PPFD distribution
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