Abstract: The invention describes methods, systems, and devices used for lighting with controllable spectrum, thereby providing a desired true radiation, true spectrum, and a uniform light distribution across a target plane. Uniform distribution of light density is achieved by an uneven arrangement of light sources, positioned in a predetermined spatial relationship. Control of the radiation emitted from each one of the light sources is performed via a controller interface connected to the system. The light sources, preferably LEDs, are installed onto a circuit board, each circuit board of a system being the same, each system comprising one or more circuit boards with light sources. The entire system of light sources is programmable for daily and long-term cycles, per user or situational preference.