A, the real name of solar tubes should be red, green and blue three-wavelength tubes, because the spectrum of this tube is red, green and blue. The three primary colors, red, green and blue, which are like sunlight, have a beam value nearly twice that of fluorescent tubes, and the light is very strong to the naked eye, with a lumen (Lm) of 9 per W (Note 1), so it is commonly known as a solar tube. This type of tube is generally used to meet the needs of westerners (blue eyes) and orientals (black eyes) (Note 2), while simulating the rising sun. Above 6°k, it is called cool color system. < P > B. Plant lamp tube, the spectrum of this type of lamp tube is mainly concentrated in two areas, such as red light and blue light wavelength. Scientists have found that the energy wave values in these two light wavelength areas are the best light source for plant growth, especially for green plants. < P > C. Strong photosynthetic lamp tube, the spectrum is still concentrated in two areas, such as red light and blue light wavelength. However, the energy wave values of these two light wavelength domains are just opposite to those of plant tubes, and the light color is light blue, but the lumen value is higher than that of plant tubes, which can be said to be an enhanced brightness type of plant tubes. < P > D. Full-spectrum tubes, as the name implies, simulate seven visible light colors of sunlight, such as red, orange, yellow, green, cyan, blue and purple, and evolve the Ra value (Note 3