| abstract |
Broadband solid state light sources include remote phosphor LED (s), short wavelength direct emitting LED (s), and long wavelength direct emitting LED (s). A diffusive or transparent cover member covers these LEDs. Each remote phosphor LED includes an LED, a phosphor layer, and a dichroic reflector. The light source can provide broadband output light over a wide color range and can efficiently do so while powering a high percentage or percentage of the total number of LEDs in the system. For example, the broadband output may exhibit a chrominance difference of 0.2 or more in CIE chromaticity units, and / or a correlated color temperature difference of 4000 or 5000 Kelvin or more, while powering more than half, or 60% or more, or 70% have. The number of LEDs may be replaced by the effective number of LEDs if LEDs of substantially different sizes are included in the light source. |