it is mainly applied in the lamp with controlling mercury vapor pressure amalgam. The indium will absorb the mercury atoms mesh in the lamp and release necessary atoms for obtaining a higher luminous flux when lighting up the lamp instantly. The climbing performance of light output when the lamp lit up is decided by the mercury absorptive amount of indium mesh, mercury-releasing speed of indium mesh, features of main amalgam, concentration of impurity gas, powder-layer materials and other factors.