apparatus and systems including one or more first leds , each first led configured to generate first radiation having a first spectrum , and one or more second leds , each second led configured to generate second radiation having a second spectrum different than the first spectrum . a diffuser is employed to blend the first radiation and the second radiation , when generated , so as to provide a uniform color of light having a visible spectrum based on a combination of the first spectrum and the second spectrum . one or more controllers are configured to control the first led and the second led such that visible light provided by the diffuser is perceived as one or more colors . in different aspects , the apparatus / systems may be configured to generate white light and / or multicolor light , may be formed to resemble conventional light bulbs , and may be arranged as a linear chain of nodes .