inputs.text: great replacehement bulb microscope illumination - led lamp serving well replacehement incandescent bulb amscope se420z microscope illuminator using electronic assehembly power source bulb 12 vac ba9s 9mm bayonet socket original bulb dim tried led bulbs designed omnidirectional illumination not much better original bulb illuminator housing focusing lens help project focused beam using led able get 3 4 times amount light work area probably mostly led projects light produces one direction perfect choice light source application