1, incandescent lamp
Incandescent lamps and halogen lamps, which appeared earlier, have the greatest advantage of being more continuous in spectrum and closest to natural light. Therefore, incandescent lamps and halogen lamps can be said to be excellent light sources for human eyes. However, incandescent lamps have a high calorific value and cannot be used for a long time.
2. Energy-saving lamps
Energy-saving lamps save electricity and have a much longer service life than incandescent lamps. However, the biggest disadvantage of energy-saving lamps is that the light source is not stable enough and the color temperature is high, so it is easy to dazzle when used as close-range lighting.
3, led lights
LED lights, also known as light-emitting diodes, can directly convert electric energy into light. LED lamps are popular because of their small size, long life, low energy consumption and environmental protection. In addition, due to the nature of light-emitting diode, it must be powered by DC to work, which determines its characteristics of no stroboscopic and no radiation, and becomes a real eye protection light source.
Skills of choosing eye protection desk lamp
1, no flicker
"No flicker" is the minimum condition of fluorescent eye protection lamp. Fluorescent eye protection lamps sold in the market are generally equipped with a flicker test gyro. When the gyro rotates under illumination, the boundary of the gyro presents a clear and stable pattern.
2. Colored lighting
Please buy a yellow and white desk lamp, not a blue and white desk lamp. Pale yellow and white light is suitable for reading and writing lighting.
3. Strength
Generally speaking, the power of fluorescent lamps is between 9W ~ 9W ~ 18W, which can meet the requirements of desktop reading and writing lighting. When the ambient brightness is low, use 9W fluorescent eye protection lamp. In the case of high ambient brightness, it is enough to use 18W fluorescent eye protection lamp.