A searchlight or flashlight including a lamp portion having multiple operative states, and an easily-operated actuator ring encircling the light and engaging at least two spaced-apart, redundant switches that are mounted on the light. These transgenic animals produce transgenic progeny. A spacer assembly being removably associated with at least one of the members for varying the distance by at least one discrete increment. The fixture mount serves as an impression post and abutment for a temporary prosthesis and is subject to chair side modifications by the surgeon.