Abstract: A lamp holder and lamp arrangement is provided to inhibit insertion of lamps having wattages greater than that for which the lamp holder is designed. A ring assembly having springs with upper and lower arms is mounted at the bottom of the lamp socket. A contact member having a predetermined geometric configuration of contact button is captured between the upper and lower spring arms. A lamp of proper wattage rating has a base center contact with a corresponding geometric configuration, so that screwing in the lamp mates the geometric configurations, thereby overcoming the spring bias of the spring lower arm, and permitting electrical contact between the contact button and a contact in the bottom of the lamp socket.