Method for controlling a lighting device for promoting the growth of a plant
A method for controlling an artificial lighting device arranged to produce radiation which promotes the growth of a plant includes at least: sets of primary and secondary lighting units arranged to produce primary and secondary radiation in primary and secondary wavelength bands, respectively, the radiation produced resulting from the combination of the primary and secondary radiation. The method includes obtaining a spectral energy distribution of the radiation produced by the device and received by the plant; determining, over a wavelength band having at least primary and secondary wavelength bands, a spectral energy distribution of a total radiation; obtaining at least one target model of the spectral energy distribution of the total radiation; and determining at least one command intended for the device on the basis of the spectral energy distribution of the total radiation, the target model and the spectral energy distribution of the radiation produced by the device.
1 . A control method for controlling an artificial lighting device arranged to produce radiation intended to promote the development of a vegetable, said device comprising at least:
one primary set of lighting units (U 11 ) arranged to produce primary radiation (R p ) in a primary wavelength band; and
at least one secondary set of lighting units (U 21 , U 22 ) arranged to produce secondary radiation (R s21 , R s22 ) in a secondary wavelength band, the radiation produced by the artificial lighting device resulting from the combination of primary radiation and secondary radiation;
wherein the control method is performed by a control unit and includes the following steps:
obtaining (E 2 ) an energy spectral distribution of the radiation produced by the artificial lighting device and received by the vegetable;
determining (E 6 ), on a wavelength band comprising at least the primary wavelength band and the secondary wavelength band, an energy spectral distribution of global radiation resulting from the combination of artificial lighting and natural lighting received by the vegetable;
obtaining (E 8 ) at least one target model of energy spectral distribution of the global radiation received by the vegetable; and
determining (E 1 ) at least one command (Cmd 1 , Cmd 2 , Cmd 3 , Cmd 4 ) intended for the artificial lighting device as a function of the energy spectral distribution of the global radiation, the target model and the energy spectral distribution of the radiation produced by the artificial lighting device.
2 . The control method according to claim 1 , comprising a step (E 9 ) of comparison between the target model and the energy spectral distribution of the global radiation, the step (E 10 ) of determining at least one command taking into account at least one difference between the target model and the energy spectral distribution of the global radiation, the command aimed at reducing said difference taking into account the energy spectral distribution of the radiation produced by the artificial lighting device.
3 . The control method according to claim 2 , wherein the comparison step (E 9 ) comprises a comparison to a target primary photon flux density of said density of global photon flux received by the vegetable on the primary wavelength band and/or a comparison to a target secondary photon flux density of said density of global photon flux received by the vegetable on the secondary wavelength band.
4 . The control method according to claim 1 , wherein the step (E 6 ) of determining the energy spectral distribution of the global radiation comprises a determination of a density of global photon flux received by said vegetable on the primary wavelength band and/or a determination of a density of global photon flux received by said vegetable on the secondary wavelength band.
5 . The control method according to claim 1 , wherein the target model is configured to evolve over time as a function of different parameters, the step of obtaining at least one target model taking into account at least one element among:
a development stage of the vegetable;
one hour of the day;
an ambient temperature;
a leaf temperature;
an absence of natural lighting;
a carbon dioxide level in ambient air; and
an ambient humidity level.
6 . A lighting system comprising at least:
one control unit;
one artificial lighting device arranged to produce radiation intended to promote the development of a vegetable, said at least one device comprising:
a primary set of lighting units arranged to produce a primary radiation in a primary wavelength band, said primary set being configured to operate with a primary electric power in an electric power range delimited by a maximum consumption primary electric power;
at least one secondary set of lighting units arranged to produce a secondary radiation in a secondary wavelength band, said secondary set being configured to operate with a secondary electric power included in an electric power range delimited by a maximum consumption secondary electric power;
an electric current supply unit arranged to provide a rated electric power included in an electric power range delimited by a maximum supply rated electric power, the power supply unit being configured to supply, in response to at least one command of the control unit, the primary set of lighting units with a primary electric power and the at least one secondary set of lighting units with a secondary electric power;
the maximum consumption primary electric power being included in a value range comprised between 90 and 100% of the maximum supply rated electric power.
7 . The lighting system according to claim 6 , wherein the maximum consumption primary electric power is greater than the maximum consumption secondary electric power.
8 . The lighting system according to claim 6 , wherein the primary radiation allows higher photonic efficiency and/or higher photosynthetic efficiency than the secondary radiation.
9 . The lighting system according to claim 6 , wherein the lighting system comprises at least one electric power converter arranged so as to allow a variation of the secondary electric power.
10 . The lighting system according to claim 9 , wherein the control unit is arranged to control each electric power converter.
11 . The lighting system according to claim 6 , wherein the lighting system further comprises:
a plurality of secondary sets of lighting units, each of said secondary sets of lighting units being arranged to produce a secondary radiation in a distinct wavelength band, each of said secondary sets of lighting units being configured to operate with a secondary electric power included in an electric power range delimited by a maximum consumption secondary electric power; and
a plurality of electric power converters, each of said electric power converters being arranged so as to allow a variation of the secondary electric power consumed by a distinct secondary set of lighting units.
12 . The lighting system according to claim 6 , wherein the control unit is arranged to control the power supply unit so as to allow a variation of the rated electric power supplied by the power supply unit.
13 . The lighting system according to claim 6 , the control unit comprises at least one first determination unit arranged to determine, on a wavelength band comprising at least the primary wavelength band and each secondary wavelength band, an energy spectral distribution of at least one radiation received by the vegetable.
14 . The lighting system according to claim 13 , wherein the energy spectral distribution of the at least one radiation received by the vegetable comprises a density of photon flux received by the vegetable on the primary wavelength band, and, for each secondary wavelength band, a density of photon flux received by the vegetable on each secondary wavelength band.
15 . The lighting system according to claim 13 , wherein the at least one radiation received by the vegetable comprises:
a radiation produced by the artificial lighting;
a radiation produced by the natural lighting;
a global radiation resulting from the combination of the artificial lighting and natural lighting.
16 . The lighting system according to claim 6 , wherein the the lighting system comprises at least one detection unit arranged to perform at least one measurement of a density of photon flux received by the vegetable and produced by at least one radiation on at least one wavelength band.
17 . The lighting system according to claim 16 , wherein the first determination unit is arranged to determine an energy spectral distribution of at least one radiation received by the vegetable taking into account at least one measurement performed by the at least one detection unit.
18 . The lighting system according claim 6 , wherein the control unit comprises an obtaining unit arranged to obtain at least one target model of energy spectral distribution of the global radiation received by the vegetable, the obtaining unit comprising at least one second determination unit configured to determine, as a function of at least one parameter, at least one target model of energy spectral distribution of the global radiation received by the vegetable.
19 . The lighting system according to claim 18 , wherein the control unit comprises a comparison unit arranged to compare the energy spectral distribution of the global radiation to at least one target model, the control unit being configured to determine at least one command taking into account at least one difference between the energy spectral distribution of the global radiation and the at least one target model, said at least one command aiming at reducing said difference taking into account the energy spectral distribution of the radiation produced by the artificial lighting device.
20 . The lighting system according to claim 19 , wherein the comparison unit is arranged to compare to a target primary photon flux density the global density of photon flux received by the vegetable on the primary wavelength band, and for each secondary wavelength band, to compare to a target secondary photon flux density corresponding to a secondary wavelength band the density of global photon flux received by the vegetable on said secondary wavelength band.