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A hand held dental instrument for curing light-curable compounds comprises a housing and an array of solid state, light emitting junctions or dies for generating light having wavelengths within a narrow band of wavelengths (e.g. 400-500 nm). Preferably, a peak wavelength of 470 nm is generated. The

A hand held dental instrument for curing light-curable compounds comprises a housing and an array of solid state, light emitting junctions or dies for generating light having wavelengths within a narrow band of wavelengths (e.g. 400-500 nm). Preferably, a peak wavelength of 470 nm is generated. The device further comprises an optical fiber light pipe for capturing the light and transmitting a beam of the light to a work surface containing a light-curable compound. An optical lens or lenses may be used for focusing the light into the light pipe.

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1. A hand held dental instrument for curing light-curable compounds curable in the mouth of a patient comprising: a housing having a handle portion for being held by a user and a barrel portion, the barrel portion configured for being manipulated to position a tip end of the barrel portion proximate

1. A hand held dental instrument for curing light-curable compounds curable in the mouth of a patient comprising: a housing having a handle portion for being held by a user and a barrel portion, the barrel portion configured for being manipulated to position a tip end of the barrel portion proximate to a curing site for curing a light curable compound;a plurality of solid state, light-emitting dies mounted in a collective array on a substrate in the housing, each die including at least one generally bare semiconductor junction, the array of dies operable for collectively emitting light having wavelengths within a narrow band of wavelengths and at a power to cure a dental compound;the substrate and array of dies being positioned proximate to the tip end of the housing barrel portion so the emitted light from the array is presented to directly illuminate a curing site;a clear lens layer positioned over the substrate and encapsulating the array of dies for directing light generated by the array. 2. The hand held dental instrument of claim 1 wherein said narrow wavelength band includes a blue light wavelength. 3. The hand held dental instrument of claim 2 wherein said narrow wavelength band includes a wavelength of approximately 470 nanometers. 4. The hand held dental instrument of claim 1 wherein the clear lens layer encapsulates an area of the substrate around at least one of the dies. 5. The hand held dental instrument of claim 1 wherein the clear lens layer forms a curved microlens over at least one of the dies. 6. The hand held dental instrument of claim 1 wherein the clear lens layer is a continuous layer over the array. 7. The hand held dental instrument of claim 1 wherein the clear lens layer includes multiple individual layers to form the clear lens layer. 8. The hand held dental instrument of claim 1 further comprising a cooling element positioned rearwardly of the tip end and array for cooling the substrate and array. 9. The hand held dental instrument of claim 8 wherein the cooling element includes a fan unit.