A dampened light apparatus for a pivotal boom on a back hoe or the like including a support for securement to a boom. A well housing is mounted on the support, and a crank arm is pivotally mounted on the support. An electric light is mounted on the crank arm together with an electric current conducting means carried by the light, the arm and the support. A dampening blade is connected to and extending radially from the arm and extending into a liquid in the well housing for movement therein so that when pivotal movement of the boom causes relative pivotal movement between the support and the arm the blade moving through the liquid dampens the pivotal movement of the arm and the light thereon.