A plant grow light, which includes a light board, a cover case and a magnetic plate. The light board are composed by red, blue and ultraviolet light-emitting diodes with different wavelength. The ratio of the different light-emitting diodes and their wavelengths are the best formula for growing succulent and cactus. The standard universal serial bus connector is adopted as power supply plug of the light board in order for user to operate it by normal computer universal serial bus ports or normal cell phone universal serial bus charger. The cover case has a groove designed to be clipped by user clip. In addition, for the installation flexibility, some magnets are attached on the cover case in order to be fixed by the magnetic plate or metal shelves.一種植物生長燈,由燈板、燈殼以及一磁力板所組成,該燈板由不同波長之紅、藍與紫外光發光二極體燈珠所組成,發光二極體之波長與各波長燈珠比例為多肉植物與仙人掌生長所需之最佳波長與比例,該燈板供電接口採用標準通用序列埠,供使用者以電腦通用序列埠或是常規行動電話通用序列埠充電器供電,生長燈之燈殼內側有凹槽構造,方便燈板抽換,邊緣亦有凹槽構造,能使用夾具固定,生長燈之燈殼外部有固定用磁鐵可與磁力板或金屬層架相吸,以增加安裝彈性。1‧‧‧燈板2‧‧‧燈殼4‧‧‧磁力板
