![]() We recommend LED bars instead of fluorescent, to avoid the heat issue altogether and eliminate the need to change bulbs. Go with a color temperature of 5500K to 6500K and around 45 watts per bulb.įluorescent bulbs will produce some heat, but using an LED for the main light source keeps it manageable. Supplement the LED with blue-spectrum fluorescent bulbs, or equivalent LED bars, hung vertically next to the plant(s). It won't be cheap, but you'll save money in the long run and avoid a lot of headaches with heat. Go with a full-spectrum LED panel with an actual wattage of 300 to 600 watts ( our recommendation). Heat can become problematic in a small grow space, so a high-output LED grow light is your best bet. High quality buds are especially important, since the small space limits potential yield size. This ensures maximum yields without needing a large number of plants. When growing weed in a tight space like a closet, you want short, bushy growth. Let's look at some of the example setups from the High Times article using this principle: ![]() With this setup, the blue light is delivered to an area of the plants where it can have the biggest impact on yield and quality. ![]() ![]() Plus, with overhead-only lighting, the lower parts of the plants are usually looser and less lush than the canopy. Red light promotes production of buds and flowers and decreases maturation time, while blue light promotes more leaves, better bud quality and tighter, sturdier growth. You get the best of both worlds with this marijuana grow light setup. The supplemental blue light encourages thick growth on the lower parts and signals plants to increase bud production further down. This leads to poor production on the lower parts of the plant. The intense light from above feeds the plants and promotes fast growth and strong bud production.īut with only overhead light, especially the reddish light from an HPS bulb, plants tend to grow tall and thin. This secondary light source hangs about a third of the way down from the top of the canopy, in the rows between the plants. This is supplemented by the blue light source, either from an MH bulb or a cold (5500K and up) fluorescent bulb or LED equivalent ( bar lights like these are excellent for this). The plants get most of their light from the overhead HPS or LED light.
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