Indoor cannabis growers use electric lights to grow weed instead of using sunlight.

Therefore, indoor growers will refer to how many “lights” they operate. A small, personal home grow would use only 1-2 lights. Large grow rooms use hundreds, and a large grow facility might have thousands of lights.

The main types of cannabis grow lights are HID, or high-intensity discharge, CFL or compact fluorescent lights, and of course, LED lights. HID lights were the most commonly used cannabis grow lights when indoor growing first became popular in the 1990s. This was because they produced just the right number of lumens to grow cannabis indoors.

Light-emitting diode (LED) grow lights have not always been popular with growers. However, technology has improved, and so have LED lighting systems.

LED grow light technology has been improving rapidly especially in the last 1-2 years. Although just about any LED grow light (even the worst ones) can grow good weed, some newer models developed specifically for cannabis are getting better yields, density, and plant growth rates than older and generic models.

HID (high-intensity discharge) is an umbrella term under which MH and HPS bulbs fall, which we’ll discuss more below. These types of lamps have a hood that reflects light and bulbs that are enclosed capsules containing a gas, as opposed to bulbs you’d find in your house, which have a filament that heats up.

HIDs have been the standard in indoor weed growing for decades, but LEDs are quickly catching up to them.

There are two types of HID bulbs: MH (Metal halide) and HPS (High-pressure sodium).

High Intensity Discharge (HID) light bulbs are the type most commonly used by cannabis growers.

Their excellent horticultural yields and good value mean that both types of them – Metal Halide (MH) and High Pressure Sodium (HPS) – are highly recommended options to illuminate your plants.

CFLs (compact fluorescent lamps). For growing weed, they are either coil bulbs or “T5s” with “T” meaning “tubular” and the “5” refers to its diameter, “⅝”.

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