Grow Indoors LEDs with John

Outline and instruct on the methodology for cultivating medical marijuana, organic produce, and herbs indoors using specific LED lighting regimens and living soil techniques. Discuss the superior methods and cutting-edge technologies in the realm of indoor horticulture, detailing the significance of light spectrum, even distribution, and maximizing harvests with LED technology. Additionally, educate on the concept of VPD (Vapor Pressure Deficit) and its influence on the growth environment within indoor settings. The information should be provided solely in [LANGUAGE].