Ed Rosenthal has been a leading educator in marijuana cultivation for decades, known for his accessible style, accuracy, and innovative content in his books. Cannabis cultivation is now easier with LED lighting. Find out how to select the right lamp and use this new technology. This book contains all the information you need to make an informed decision when choosing the right lamps for cannabis cultivation. Like any good guidebook, this volume includes all the essential information about growing cannabis under LEDs, which are the only lamps available to growers, given the obsolescence of inefficient HPS and fluorescent lamps. There are many brands and models of different lamps for plant cultivation that vary significantly in their efficiency and flexibility. The book shows how to compare them and select the right lamps for your purposes. This might be the most important choice a grower makes when assembling a garden. Additionally, it explains how to use LED technologies. This helps both beginners and experienced growers avoid common mistakes that can impact crop yield and quality. LEDs vary widely in design, each suited to different garden setups, making proper selection essential for maximizing efficiency and minimizing yield over time. It's important to choose the right one. The investment in LED lamps is just a down payment on the cost of electricity that they will use. The amount of light they emit per unit of power they use has a significant effect on costs of cultivation. This guide serves as an indispensable resource for growers at all levels, ensuring they are well-equipped to navigate the complexities of LED selection and usage effectively.