A semi-operational experiment at the Faculty of Horticulture of Mendel University in Brno

The company TESLUX Lighting s.r.o. has participated in an experiment commissioned by an agricultural company interested in investing in the construction of greenhouses for growing tomatoes. The agricultural company which operates its own biogas station therefore decided to finance a semi-operational experiment at the Faculty of Horticulture of Mendel University to check properties and efficiency of several selected LED luminaires.

The Faculty of Horticulture undertook to implement the experiment, to provide a standard evaluation and deal with LED luminaires suppliers and institutions ensuring relevant gauging.

The experiment was implemented in the greenhouses of the Mendel University Faculty of Horticulture in Lednice.

Four types of LED luminaires by three producers and HPS discharge lamps were tested.

The planting of tomato seedlings was done in the last week of September 2017 and supplementary lighting was launched on October27. The experiment lasted and was gradually evaluated till June 28, 2017.

The result of the experiment and final evaluation from the Mendel University Faculty of Horticulture

The variants illuminated with TESLUX luminaires showed the lowest consumption in kWh.

Of the tested types of lamp at the Faculty of Horticulture in Lednice the recommendation goes to LED lamps made by the company TESLUX Lighting s.r.o. under which the generally highest yield was achieved in the case of Brioso tomato variety.

LED lamps made by the company TESLUX Lighting s.r.o. have a reduced light spectrum to a blue and red segment and in addition they are equipped with optic parts that narrow the radiated light to the area of tomato patches thus saving the energy spent on the yield of crop even more.

Source: https://netled.fi/

Results of the semi-operational experiment

Table continuation


High effectiveness up to 2.2μmol/J, 50 % energy saving compared to common HPS lamps
Modular construction. Easy to replace and upgrade
Optional optic variants = even distribution of light for all situations
Long lifespan and warranty. It eliminates costs of maintenance and repairs
IP66 protection, good for all kinds of environment
Programmable spectrum, support for various plants


Input voltage (V)176 - 264
Frequency range (Hz)47 - 63
Power factor> 0.9
Energy efficiency> 90 %
Input (W)Max. 250
Luminous output (μmol / s / W)2.2
Main wavelength (nm)460 / 660
Blue light, range of modulation1% ~ 50%
Proportion of green< 5 %
L70 life span (h)50 000
L90 life span (h)25 000
Operating temperature (°C)-30 až +50
Operating humidity10 % - 90 %
Storage temperature (°C)10 - 85
MaterialAluminum alloy
Dimensions (mm)714 x 481 x 95 mm
Net/gross weight (kg)12 kg / 13 kg

The most common lamps used for supplementary lighting in greenhouses are high-pressure sodium HPS lamps emitting almost the entire spectral range most of which, over 70% of the el. input, is emitted in long-wave heat radiation. These lamps provide a high production of plant mass while nutritional quality of the fruit often lags behind.

The advantage of LED lamps is the fact that they emit a high portion of radiation in the visible light spectrum and their wavelengths can be modified by the arrangement of diodes according to the cultivars being grown in the greenhouse. That is why they are capable of saving up to 50% of electric power.

Tomatoes rank among the most demanding greenhouse crops with a need of minimal photon flux 170 and maximal 200 μmol/m2 /s. Optimal photon flux for their supplementary lighting is 185 μmol/m2/s.

Current LED lamps fully cover the plants’ need for PAR light by supplementary photosynthetic lighting. The results of our experiment prove that.

The spectrum of TESLUX LED luminaires is combined with the blue part [430 nm] and red part [660 nm] of the spectrum.

Interested in a non-binding offer? Contact our representative Martin Koneček on e-mail konecek@teslux.cz

Selected references