LED technology has emerged as a recent trend in alternative lighting system in greenhouses as well as growth chambers for various horticultural crops. The experiment was conducted in CPCT-IARI (ICAR), New Delhi under a constructed growth panel system. Potted plants of Chrysanthemum morifolium cv. Zembla were used as an experimental crop. The lighting sources consisted of: Fluorescent light, LEDs (red, blue, white) and mixture of LEDs (80% red and 20% blue). The various LED sources had a significant impact on various physical parameters. The treatment with 80% red and 20% blue LED resulted in an overall increase in height, stem diameter, leaf area and number, and leaf area index. Whereas, least increase in plant height was observed with blue LED, Leaf area, number and leaf area index were observed to be minimum in white LEDs. This LED system can prove to be a beneficial investment in plant programing and to get greater stem length as desired by the cut flower market.