For a reflection type hologram such as Lippmann hologram, an incoherent light can be used to reconstruct the image. An artificial light emitted by electric lamps such as halogen lamps is frequently used for this purpose. Incoherent light is of great use for the deep or protruded image reconstruction. However, it has been considered that a good image was could not be obtained using commercial lamps with the narrow beam angles. This paper investigates other factors of lamps referring to the principle of holography.