Assimilation Light

Grow light

Light is an important topic in growing flowers, it is the basic in the photosynthesis process. Light is present in the spectrum of global light from 380nm(blue), 500nm(green), 555nm(yellow), 600nm(orange), 620nm(red), 680nm(deep red). (nm=nanometer) Growing is possible in all zone’s ( PAR: Photosynthetic, Active, Radiation) Not in every zone it is very efficient. Research in the photosynthetic process gave information about plant reactions in all zone’s. Plants are growing more efficient in the blue and red spectrum compared to the other part of the total light spectrum. For assimilation light we have bulbs designed in Umols, these are special bulbs developed for Photosynthetic needs. These bulbs were introduced in 2003. From this period Philips and GE are producing bulbs with specifications in Umols and not anymore in Lux. Before 2003 only Lux, as light rate definition, was common because the design was for street lighting and was later also introduced for assimilation light installations in agriculture in greenhouses mainly.

For every crop in every circumstance I calculated the best solution.

In my offers I calculate an installation in 50% and 100% application, this may give growers more possibilities to control the plant temperature. ( to be able to prevent stress situations in the photosynthetic process). Because the more control on plant environment, the better results/harvest per m2!!

With an investment in assimilation light it is very important to control the running and maintenance costs. The result will be a more efficient and shorter urn-back time.

Every offer includes: every year measurements in bulbs and reflectors for controlling running costs.


  • 1000 lux can be compared to 12 Umol.
  • Umols can be recalculated to Joules
  • Bulbs have a life time of 10.000 hrs/12.000 burning hrs
  • Reflectors are important in efficiency: in reflecting and spreading the light equally
  • Bad installation may cause voltage drops and loss of light
  • Different crops needs different levels of light.

Grow light advisor


Aad van Ruyven

Supplemental Light Introduction Chrysant-klein Supplemental Light Introduction Chrysant-bloei

back to overview