The present invention provides an illumination method for controlling plant growth, which is applied to a plant lamp for irradiating the plant. The method includes the following steps: first, the plant lamp irradiates the plant with a first mixed color light at the first time period, in which the first mixed color light has a first primary peak value of the wavelength between 415nm-445nm and a first secondary peak value of the wavelength between 435nm-465nm next, at the second time period after the first time period, the plant lamp irradiates the plant with a second mixed color light, in which the second mixed color light has a second primary peak value of the wavelength between 595nm-625nm and a second secondary peak value of the wavelength between 415nm-445nm finally, at the third time period after the second time period, the plant lamp irradiates the plant with a third mixed color light, in which the third mixed color light has a third primary peak value of the wavelength between 595nm-625nm and a third secondary peak value of the wavelength between 415nm-445nm. Thus, the present invention may provide the illumination of different color temperatures according to different illumination requirements for the plant during one day to promote the plant growth.一種控制植物生長的照光方法,應用於照射植物的植物燈,首先於第一時段,植物燈以第一混色光照射植物,第一混色光具有波長介於415nm-445nm的第一主峰值及波長介於435nm-465nm的第一副峰值;接著於位於該第一時段之後的第二時段,植物燈以第二混色光照射植物,第二混色光具有波長介於595nm-625nm的第二主峰值及波長介於415nm-445nm的第二副峰值;最後於位於該第二時段之後的第三時段,植物燈以第三混色光照射該植物,第三混色光具有波長介於595nm-625nm的第三主峰值及波長介於415nm-445nm的第三副峰值。據此,依據該植物一天對於照光的不同需求,給予不同的照光色溫,促進植物生長。10...植物燈11...控制單元20...植物
