The newest type of grow lights use LED technology. One major advantage to the LED grow lights is the small size. LED grow lights are only a few inches in diameter and are easy to mount. In some greenhouses, LED grow light may be the only practical light option. Hanging most grow lights requires a strong greenhouse structure and a place to hang the lights. LED grow light weigh a fraction of other lights and are easy to configure where needed. According to LED manufacturers, LED grow light maximize blue and red light to provide and excellent balance for plants. They do not have much green-yellow light. Since humans see green-yellow light best LED grow lights appear dim to our eyes. And the most important advantage is that LED grow light is green technology which don't contain any harmful substance like HID or other traditional grow lights, and it can save 70-80% electricity bill than using HID lamp. This is newest technology used for plant growing now and becoming more and more popular.

In this article we provide an overview of three main grow light technologies: indoor LED grow lights, Fluorescent Lights and HID lights. We do not cover incandescent light as these are no longer regularly used for grow lights indoor gardening, only for garden lighting. The best grow lights are able to mimic the precise wavelengths of light that can be used by plants in their photosynthesis and thereby provide the energy for plant growth, flowering, seedling and so on. So lets get started on the three grow light types.