Certainly plants which are sensitive to fluctuations over the canopy in received PPFD like most ornamentals are in absolute need of a proper light distribution.
This result in different PAR values over the canopy with fluctuations in the growth process as a result.
This means that when the energy directly under the light fixture = 100%, you will have a light and energy decrease to 80% at 30 degrees left and right, and a further erosion to 40% at 60 degrees left and right of the luminaire.
Of course you can kind of overcome this by placing many LED grow lights close together and make overlaps so that the energy at the plant canopy gets a bit more in balance, but in many cases we still see fluctuations of over 30%, while this also leads in many cases to the need of placing extra construction bars in the greenhouse which you actually don’t want.
All initial output light beams of the LED package are scattered and redistributed in a light shape in this way that the light within the beam angle is complete even distributed. As a result you get a homogeneous light distribution over your canopy > 90%.
Batwing light distribution creates an even light distribution within the beam angle.
So for lighting applications where light distribution is a must, you want to create a light source as small as possible in order to have a perfect beam control.
In LED lighting more complex beam shapes are created through a TIR or Total Internal Reflection lens.
Once aluminum or copper as a conductor becomes too slow to conduct the heat, a heat pipe is an easy and price friendly alternative to transport the heat away from the LED source towards an area where the convection and radiation can be realized.
Similar as the use of diffuse glass in greenhouse cultivation, a scattering and refraction of the light distribution of LED grow lights can make an immense contribution to a better distribution in the depth of the plants, leading to an immediate increase in photosynthesis and extra growth.
Light is more homogeneously distributed under diffuse light (B) compared with direct light (A) where many sun flecks in the middle and lower part of the canopy are seen. (Li et al., 2014a/b, photo courtesy of Wageningen UR Greenhouse Horticulture, Bleiswijk)
Even the beam pattern can be adapted to the size of the canopy resulting in square or rectangular beam patterns, ideally for floriculture projects with LED lights or sensitive crops to variations in PAR.
The batwing principle – individual light beams are modulated for a complete even light distribution.
All together these full passive cooled advanced grow lights produce an absolute market leading PPFD up to 1.950µmol/s.