A proposed model of light quality regulation of photosynthesis and fruit metabolism in tomato. Manipulation of light environments promotes the accumulation of chlorophyll, carotenoid, and anthocyanin, and enhances photosynthesis and electron transport rates by increasing the density of active reaction centers and the expression of LIGHT-HARVESTING COMPLEX B and A, resulting in increased plant biomass in tomato. In addition, R1W1B0.5 light induces fruit ripening and carotenoid accumulation by decreasing the expression of LYCOPENE β-CYCLASE (SlCYCB). In brief, R1W1B0.5 light noticeably promotes photosynthesis, biomass, and fruit quality through the photoreceptor (SlPHYB1 and SlCRY1)-SlHY5-SlLHCA/B/SlCYCB module in tomato.