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indoor grow lights for cannabis

Indoor grow lights for cannabis

Note: When shopping for LEDs, make sure they contain some amount of green or white (full spectrum) light. Plants grown without at least a tiny amount of green or white light are very prone to nutrient deficiencies and simply don’t grow as well. Learn more about how light spectrums affect cannabis growth!

Metal Halide grow lights are generally used for the vegetative stage because they produce a bluish light that vegetative plants love, though this type of light can also be used all the way to harvest.

High Pressure Sodium grow lights are often used during the flowering stage because they are very efficient and their yellow light stimulates bud production. HPS grow lights in the flowering stage get better yields per watt of electricity than any other type of grow light available today, which is a big part of why they are so popular.

The light from an HPS appears yellow, and is great for flowering plants because the light spectrum stimulates bud production

There is a larger size MH/HPS grow light available (1000W), but at that size it starts going outside the scope of a “hobbyist” grower as far as ease and yields. In addition to needing a lot of extra cooling which costs electricity, a 1000W HPS grow light is less efficient compared to a 600W grow light (as far as how much light is put out for electricity used). I think most hobbyist growers would be happier with a 600W, or even two 600W lights, over a 1000W

These cannabis plants are thriving under T5 grow lights

Note 2: Incandescent light bulbs (old fashioned light bulbs) are NOT suitable for growing marijuana!

Metal Halide (MH) Grow Lights

Fluorescent grow lights come in many different shapes and sizes, from twisty bulbs to long tubes. Fluorescents are popular because they make efficient and pleasant lighting for humans, and also work great for herb gardens and other types of low-key indoor gardening without using a lot of electricity.

Indoor grow lights for cannabis

How big is your grow room going to be? If you don’t have much space, you should steer clear of ‘hot’ lights, or else the room’s temperature will increase rapidly. You also won’t have enough space to install an AC unit.


High-Pressure Sodium, or HPS, grow lights are far more efficient than other forms of HID. They emit a gentler, yellow light that cannabis prefers when it is in the flowering stage. This yellow light helps encourage intense bud production. In addition, it allows you to configure the eventual size of your harvest more precisely.

Final Thoughts on the Best Grow Lights for Indoor Marijuana

● They’re typically the choice of professionals.