unit in a narrower or wider beam in response to moving the led alternately the light emitting element may be an optical waveguide with a receiving end proximate to the led emitting face and an emitting face away from and opposite the receiving face the optical waveguide may collimate the wide angle of light emitted by the led to form a narrow directed beam application_number US 46934106 A description fig1 shows the replacement of a bulb in an appliance generally identified by the number 2 an appliance 4 with a socket 6 for mounting a bulb is shown a conventional bulb 8 is removed and is being replaced with an led lamp or unit 10 to reduce power consumption and heat generation by the appliance led unit 10 generally includes a light emitter to collimate light from the led light source appliance 4 may be an arm lamp a puck light track lighting or a similar lighting device that may use a halogen incandescent fluorescent or other bulb with less efficient lighting characteristics than led lighting unit 10 a first embodiment of led unit 10 is shown best in fig2 and 3 referring first to fig2 a side cross section view of unit 10 in a first embodiment shows a lighting unit housing 12 which supports a light emitter in the form of reflector 14 and a plug base 16 which retains connector pins 18 and an insulator 20 housing 12 also supports led assembly 22 comprising led base 24 which holds led 26 including led lens 28 sheath 30 screw knob 32 screw 34 collar 36 and assembly member 38 led assembly 22 is connected.