100 pages ; Vegetable production in controlled environment agriculture (CEA) is growing in the U.S. agriculture sector and causing an increase in energy use due to artificial lighting and climate control. Improvement of lighting systems is necessary for CEA to be economically viable and reduce its carbon footprint. In the first chapter of this thesis the effect of specific blue/green spectra on lettuce growth and yield is investigated. Three blue and one green wavelength light treatments (peak and full width at half max (FWHM): 412 nm, 16 nm; 425 nm, 15 nm; 454 nm, 20 nm; or 523 nm, 34 nm) supplied 20% of the photosynthetic photon flux density (PPFD) and red light (661 nm, FHHV 21 nm) supplied 80%. Significant differences in biomass and pigmentation were found among the different blue light treatments and among the blue and green lighting treatments. Peak wavelength treatments with 454 and 523 nm led to the greatest increases in pigmentation and biomass, respectively. The second lettuce experiment was designed to determine whether the biomass benefits of green light could be complemented with the darker pigmentation of blue light when green was substituted with blue light 0 (control), 2, 4, or 8 days prior to harvest. Just two days of blue light irradiation at the end of the crop cycle improved crop quality in terms of leaf coloration for both cultivars evaluated with no effect on biomass.A third experiment was conducted and is described in Chapter 2. Implementing efficient lighting control algorithms to complement sunlight and CO2 enrichment is another strategy to optimize crop productivity while reducing energy use. The objective of the second chapter was to evaluate tomato yield and quality when using the CO2 light and shade systems implementation (CO2 LASSI) control algorithm or the light control algorithm at ambient CO2 (LASSI). CO2 LASSI manipulates the daily light integral (DLI) target and CO2 supplementation (targeting a virtual DLI) to ensure the same growth rate as LASSI that uses the DLI target and ...