| http://www.w3.org/ns/prov#value | - The light emitting element recited in claim 19 wherein at least two of said at least two reflective surfaces are substantially parallel and separated by greater than (N-0.1) quarter wavelengths and by less than (N+0.9) quarter wavelengths where N is an odd numbered integer, said quarter wavelengths being measured at said center wavelength.
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