LED PLANT GROWTH LAMP SPECTRUM

Abstract

An LED plant growth lamp spectrum, the spectrum including: a light wave of 500-599 nm and a light wave of 700-780 nm, where a ratio of the number of photons in the range of 500-599 nm to the number of photons in the range of 700-780 nm is 0.9-1.6:1. The LED plant growth lamp spectrum promotes indoor cultivation and growth of plants, and helps to increase the yield of medicinal components per unit area and per unit time in the factory production.

Claims

1. An LED plant growth lamp spectrum, comprising: a first light wave having a wavelength of 500-599 nm, and a second light wave having a wavelength of 700-780 nm, wherein a ratio of a number of photons of the first light wave to a number of photons of the second light wave is (0.9-1.6):1.

2. The LED plant growth lamp spectrum according to claim 1, wherein a peak wavelength of the first light wave is in a range of 510-526 nm in a band of 500-550 nm.

3. The LED plant growth lamp spectrum according to claim 1, wherein a peak wavelength of the second light wave is in a range of 730-740 nm in a band of 700-750 nm.

4. The LED plant growth lamp spectrum according to claim 1, further comprising: a third light wave having a wavelength of 600-699 nm and a fourth light wave having a wavelength of 400-499 nm.

5. The LED plant growth lamp spectrum according to claim 2, wherein a full-width-at-half-maximum of a corresponding peak light wave in the band of 500-550 nm is less than 50 nm.

6. The LED plant growth lamp spectrum according to claim 1, wherein photons of the first light wave account for 18-26% of all photons of the LED plant growth lamp spectrum.

7. The LED plant growth lamp spectrum according to claim 4, wherein a ratio of a number of photons of the third light wave to a number of photons of the fourth light wave is 3.8-4.8:1.

8. An LED plant growth lamp using the LED plant growth lamp spectrum according to claim 1, wherein the LED plant growth lamp has a spectrum a same as the LED plant growth lamp spectrum.

9. A method of using the LED plant growth lamp in an indoor cultivation of a cannabis according to claim 8, comprising the following step: using the LED plant growth lamp to promote an accumulation of cannabinoid secondary metabolites in the indoor cultivation of the cannabis.

10. The method according to claim 9, wherein, during a growth of the cannabis, making the LED plant growth lamp have a light intensity ranging from 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s and a light period of equal to or less than 15 hours day.

11. The LED plant growth lamp according to claim 8, wherein a peak wavelength of the first light wave is in a range of 510-526 nm in a band of 500-550 nm.

12. The LED plant growth lamp according to claim 8, wherein a peak wavelength of the second light wave is in a range of 730-740 nm in a band of 700-750 nm.

13. The LED plant growth lamp according to claim 8, wherein the LED plant growth lamp spectrum further comprises a third light wave having a wavelength of 600-699 nm and a fourth light wave having a wavelength of 400-499 nm.

14. The LED plant growth lamp according to claim 11, wherein a full-width-at-half-maximum of a corresponding peak light wave in the band of 500-550 nm is less than 50 nm.

15. The LED plant growth lamp according to claim 8, wherein photons of the first light wave account for 18-26% of all photons of the LED plant growth lamp spectrum.

16. The LED plant growth lamp according to claim 13, wherein a ratio of a number of photons of the third light wave to a number of photons of the fourth light wave is 3.8-4.8:1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG. 1 is a spectral distribution diagram of an LED plant growth lamp used in Embodiment 1.

[0021] FIG. 2 is a spectral distribution diagram of an LED plant growth lamp used in Embodiment 2.

[0022] FIG. 3 is a spectral distribution diagram of an LED plant growth lamp used in Embodiment 3.

[0023] FIG. 4 is a spectral distribution diagram of an LED plant growth lamp used in Embodiment 4.

[0024] FIG. 5 is a spectral distribution diagram of an LED plant growth lamp used in Embodiment 5.

[0025] FIG. 6 is a spectral distribution diagram of an LED plant growth lamp used in Embodiment 6.

[0026] FIG. 7 is a spectral distribution diagram of an LED plant growth lamp used in Embodiment 7.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention is further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto. Various alternatives and modifications made according to the ordinary skill and conventional means in the art without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Embodiment 1

[0028] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, an LED plant growth lamp provided by the present invention was used to provide a light source. FIG. 1 is a spectral distribution diagram of the used LED plant growth lamp, where the light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, the spectral composition was: 18.2% of a light wave of 500-599 nm, 20.2% of a light wave of 700-780 nm, 50.4% of a light wave of 600-699 nm, and 11.2% of 400-499 nm, a peak wavelength was 510 nm in a band of 500-550 nm, and a full-width-at-half-maximum of a peak light wave was 29 nm.

Embodiment 2

[0029] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, an LED plant growth lamp provided by the present invention was used to provide a light source. FIG. 2 is a spectral distribution diagram of the used LED plant growth lamp, where the light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, the spectral composition was: 21.7% of a light wave of 500-599 nm, 16.7% of a light wave of 700-780 nm, 49.8% of a light wave of 600-699 nm, and 11.8% of 400-499 nm, a peak wavelength was 515 nm in a band of 500-550 nm, and a full-width-at-half-maximum of a peak light wave was 34 nm.

Embodiment 3

[0030] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, an LED plant growth lamp provided by the present invention was used to provide a light source. FIG. 3 is a spectral distribution diagram of the used LED plant growth lamp, where the light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, the spectral composition was: 23.6% of a light wave of 500-599 nm, 16.9% of a light wave of 700-780 nm, 49.1% of a light wave of 600-699 nm, and 10.4% of 400-499 nm, a peak wavelength was 519 nm in a band of 500-550 nm, and a full-width-at-half-maximum of a peak light wave was 27 nm.

Embodiment 4

[0031] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, an LED plant growth lamp provided by the present invention was used to provide a light source. FIG. 4 is a spectral distribution diagram of the used LED plant growth lamp, where the light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, the spectral composition was: 21.2% of a light wave of 500-599 nm, 19.3% of a light wave of 700-780 nm, 47.8% of a light wave of 600-699 nm, and 11.7% of 400-499 nm, a peak wavelength was 523 nm in a band of 500-550 nm, and a full-width-at-half-maximum of a peak light wave was 35 nm.

Embodiment 5

[0032] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, an LED plant growth lamp provided by the present invention was used to provide a light source. FIG. 5 is a spectral distribution diagram of the used LED plant growth lamp, where the light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, the spectral composition was: 22.6% of a light wave of 500-599 nm, 15.1% of a light wave of 700-780 nm, 49.3% of a light wave of 600-699 nm, and 13.0% of 400-499 nm, a peak wavelength was 526 nm in a band of 500-550 nm, and a full-width-at-half-maximum of a peak light wave was 30 nm.

Embodiment 6

[0033] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, an LED plant growth lamp provided by the present invention was used to provide a light source. FIG. 6 is a spectral distribution diagram of the used LED plant growth lamp, where the light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, the spectral composition was: 24.7% of a light wave of 500-599 nm, 17.6% of a light wave of 700-780 nm, 47.0% of a light wave of 600-699 nm, and 10.7% of 400-499 nm, a peak wavelength was 520 nm in a band of 500-550 nm, and a full-width-at-half-maximum of a peak light wave was 27 nm.

Embodiment 7

[0034] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, an LED plant growth lamp provided by the present invention was used to provide a light source. FIG. 7 is a spectral distribution diagram of the used LED plant growth lamp, where the light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, the spectral composition was: 25.9% of a light wave of 500-599 nm, 16.2% of a light wave of 700-780 nm, 47.0% of a light wave of 600-699 nm, and 10.9% of 400-499 nm, a peak wavelength was 520 nm in a band of 500-550 nm, and a full-width-at-half-maximum of a peak light wave was 27 nm.

Comparative Example

[0035] The cannabis seedlings with the better roots were transplanted into a substrate or a rock wool. Four plants are placed within one square meter. The ambient temperature was set to T=24-26° C. and the humidity was T=RH60-70%. When the height of plants was about 20 cm, the plants were topped for promoting the growth of lateral branches. When the lateral branches were grown for two weeks, the lateral branches were topped to obtain more lateral branches. After four weeks, reproductive growth is beginning. During the reproductive phase, a high pressure sodium (BPS) lamp was used to provide a light source. The light intensity was 200 μmol/m.sup.2s to 1000 μmol/m.sup.2s, the light period was 14 h, and the spectral composition was: 50.0% of a light wave of 500-599 nm, 7.9% of a light wave of 700-780 nm, 37.9% of a light wave of 600-699 nm, and 4.2% of 400-499 nm.

[0036] The content of tetrahydrocannabinol (THC) in cannabis cultivated by the cultivation methods described in Embodiments 1-7 and Comparative Example 1 was measured, and the results are shown in Table 1.

TABLE-US-00001 Full-width-at- Ratio of number of Ratio of number Peak half-maximum of Proportion photons in range of photons of wavelength corresponding of light of 500-599 nm 600-699 nm in interval of peak light wave wave of to number of to number of THC 500-550 nm in interval of 500-599 nm photons in range photons of content (nm) 500-550 nm (nm) (%) of 700-780 nm 400-499 nm (%) Comparative — — 50 6.3 9.0 15.8 Example Embodiment 1 510 29 19.2 0.9 4.5 22.9 Embodiment 2 515 34 21.7 1.3 4.2 23.3 Embodiment 3 519 27 23.6 1.4 4.7 24.0 Embodiment 4 523 35 21.2 1.1 4.1 23.7 Embodiment 5 526 30 22.6 1.5 3.8 23.1 Embodiment 6 520 27 24.7 1.4 4.4 23.8 Embodiment 7 520 27 25.9 1.6 4.3 23.2

[0037] It can be seen from Table 1 that the THC content in cannabis can be increased by 44-52% by the LED plant growth lamp provided by the present invention in comparison with the high pressure sodium lamp (BPS) while other growth conditions and light intensity are the same.