The acronym HID stands for High Intensity Discharge. These lights are known for their impressive light output and brightness. I have seen these used in the biggest and best commercial grows throughout the world.
The lights used today for commercial growing are modernized versions of the gas lamps used for centuries.

The lights are made from special gas-filled bulbs with two electrodes inside. The electricity arcs from one electrode to the other and interacts with the gas within the bulb, generating a brilliant light.
What Are LED Grow Lights?
Light Emitting Diode (LED) grow lights are actually a grid of hundreds or thousands of individual LED chips. These chips are known as diodes, and they are capable of producing a specific narrow ranges of color.

Any individual chip will produce only that specific color, blue, red, ultra violet, infrared, or whatever. They are usually combined in a specific manner to maximize the spectrum of light they produce.

When the diodes are combined, they can appear to create any color to our eyes because of the way light colors mix. However, hydroponic grow lights usually appear purplish in color as you can see in the photo above.
The light LEDs produce is not as intense as HIDs, and more of them are required to get the same sort of yields that HID lights are capable of producing. Also, the LED grow lights need to be kept very close to the canopy.

Even still, marijuana grow lights are known for their efficiency, cooler operating temperatures, and a comparable set will use less energy than the HID set.
Which is the Best Grow Light?
Deciding which type of light is best isn’t as simple and straightforward as you may think. There are definite benefits and disadvantages with each type of light. Let’s go through some of the major differences when we talk HID vs LED Grow Lights. Hopefully, this information will make it clear which option is best for your needs.

LED Grow Lights Produce Less Heat

diy led grow light at a similar power level to HID grow lights produce significantly less heat. This means you won’t spend as much energy on cooling with an air conditioner. It also makes them a bit better for growing in small concealed spaces.

On the other hand are HID grow lights from DimLux with NanoTubes, like the 1000 watt HPS and the 630 CMH with Square Wave. The NanoTubes are a DimLux proprietary cooling system that extracts the hottest air from the grow lights directly, using a separate air system.