an illuminating headlamp consisting of a headband and at least one optical device providing illumination at a known distance from said optical device attached to said headband . each optical device consists of a housing having an open first end and an open second end . there is a light emitting device attached to a mounting which is attached to the second end causing said light emitting device to be orientated at a known angle to an axis of said housing . at least one optically transparent lens is incorporated into said first end , and a means for adjusting said optically transparent lens in order to cause a focal point of the lens to be positioned behind said light emitting device , wherein a zone of substantially uniform illumination is projected at said known distance .