Activity 2 Directions: Complete the statement about an incandescent lanp. Choose your answer inside the box. 1. Incandescent lamps are often considered the energy ellicient type of electric lighting is the emission of light caused by heating the filament. candescent lanp is inexpensive to buy but to operate. is widely considered to be the inventor of incandescent lainp. 5. Joseph Wilson Swan was a physicist who actually received the first patent for a complete incandescent light bulb with a carbon filament 1​