and green wavelengths by raising the reflectivity for alternate wavelengths the cavity efficiency can be raised from 50 in one case to over 80 an increase of 60 in light output fig7 depicts an enhanced recycling optical cavity which contains leds 43 41 and 39 a dichroic coating 44 40 and 42 is on at least one led 43 41 and 39 the dichroic coating 44 40 and 42 may be directly coated on leds 43 41 and 39 or be a separate layer which is adhered or otherwise held within the cavity formed by leds 43 41 and 39 more or less leds may be used to form the recycling optical cavity the function of the dichroic coating 44 40 and 42 is to selectively pass emission from the associated led 43 41 and 39 and reflect the emission from the other leds within the cavity this will enhance the efficiency of the cavity a preferred embodiment of this invention is the use of this technique to isolate alingap red leds from gan blue and green leds however the use of this technique is also disclosed for all leds used within a recycling optical cavity fig8 depicts an enhanced recycling optical cavity is which at least one led 45 46 and 47 is stacked together forming a layered emitter rather than just a single emitting layer the at least one led 45 46 and 47 may be mounted within a recycling optical cavity 48 which enhances radiance creates directivity recycles polarization and or allows for the use of wavelength conversion means as disclosed by the authors in previous filings and are included herein a preferred.