I'm currently searching for LEDs specifically full white light, 455 nm blue, 660 nm red and 730 nm far-red LEDs. I got these wavelength values from multiple papers and communicating with Grobotic Systems, which is a smart growth chamber manufacturers.  The design in mind is a similar to a beehive, where LEDs of different wavelengths are placed next to each other, each contributing to the total radiation output. 

Next I'll be looking for reflective surfaces to attach to the walls to increase the overall light intensity of the chamber.