US Patent 9869432 Luminaires using waveguide bodies and optical elements

According to one aspect, a luminaire includes a waveguide body having an interior coupling cavity extending into a portion of the waveguide body remote from an edge thereof. The luminaire further includes an LED element extending into the interior coupling cavity having first and second sets of LEDs wherein each LED of the first set comprises a blue-shifted yellow LED and each LED of the second set comprises a red LED wherein the red LEDs are disposed between the blue-shifted yellow LEDs and wherein the blue-shifted yellow LEDs have a first height and the red LEDs have a second height less than the first height. The LED element further includes a lens disposed over the first and second sets of LEDs.