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More about grow lights
Start from the space you are lighting. Fixtures quote a coverage footprint, and a light sized for a two by two tent will disappoint in a four by four. Bar-style LEDs spread output over a wider area than a single panel, HID fixtures run hot enough to change how you vent a room, and fluorescent strips are aimed at seedlings and clones.
Lighting is the piece of a grow setup that shapes the rest of the list. Heat output drives what you need for climate control, and the footprint has to match the space, so many people pick their light and their grow tents together. Home cultivation limits differ by state, including how many plants you may keep, so check your local rules before buying.
Frequently Asked Questions about grow lights
What are grow lights and how do they work for cannabis?
Grow lights are electric fixtures that stand in for sunlight indoors, delivering the spectrum and intensity a plant needs to photosynthesize. Where home cultivation is legal, three types dominate: LED, HPS (high pressure sodium), and CMH (ceramic metal halide). LED runs coolest and most efficient per watt. HPS puts out heavy red-shifted light and a lot of heat. CMH sits between them with a broader, more sunlike spectrum. Fixtures hang above the canopy on adjustable ratchet hangers and run on a timer, commonly 18 hours on during vegetative growth and 12 hours on to trigger flowering. The two numbers that actually matter are PPFD, the light intensity reaching the canopy, and DLI, the total light delivered over a full day. Manufacturers list a recommended coverage area alongside those figures.
Why is wattage a poor way to compare grow lights?
Wattage measures what a fixture pulls from the wall, not what reaches your plants. Two 400 watt LEDs can differ widely in efficiency (stated as micromoles per joule) and in how evenly they spread light. Compare published PPFD maps over a stated footprint instead, against targets of roughly 300 to 600 PPFD in vegetative growth and 700 to 1000 in flower. Buy for coverage area first, because a fixture sized for a 2x2 leaves the corners of a 4x4 dim.
Where do I buy grow lights near me?
Grow lights come mostly from hydroponics stores, indoor garden shops, and online retailers rather than dispensaries. Browse grow lights on Leafly to compare fixture types and coverage areas, and see which licensed dispensaries also stock basic cultivation gear.