There are several aspects to consider when choosing LEDs for horticultural lighting. Some of the most important factors include spectrum, efficacy and lifetime. Quantity and quality of cultivation largely depend on the choice of LEDs. In this presentation, the latest LED technology for horticultural lighting will be discussed. How LED suppliers engineer spectrum, improve efficacy (μmol/J), and enhance lifetime will be highlighted. Audiences will also learn about the pros and cons of full vs. narrow spectrum, the impact of LED efficacy on lighting fixture cost, and the technology to prevent chemicals used in horticultural applications.