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This study was conducted to produce potato (Solanum tuberosum L. cv. Dejima) quality transplants under controlled environment Evapotranspiration rate (EVTR) of potato plantlets and cuttings increased with increasing PPF and decreasing relative humidity. Considering the evapotranspiration and survival rate of plantlets after transplanting, PPF of 50-75 molm-2s-1 and relative humidity higher than or equal to 90% can be suggested as optimal environments for healthy growth. When relative humidity was controlled at 85-100%, PPF of 100 molm-2s-1 was considered as the limit of PPF for root initiation and development of stem cuttings. Although plant height, root length, number of leaves, fresh and dry weight, and chlorophyll content were greatly affected by PPF, potato transplants grown under different PPF in transplants production factory showed externally vigorous growth.