Heat: Traditional grow lights get hot and heat can be a problem. The more watts of light you use, the more heat those lights generate. Even 250 watt lights can heat a small area beyond acceptable limits. If the temperature gets too hot it could have a negative effect on the plants by slowing down growth or killing them.  Some growers use an air conditioner to cool the air, others prefer to vent hot air from the ceiling into another room, attic, or outside through the chimney, roof, or wall. Your local hardware store should have some kind of exhaust system. I've seen bathroom fan, dryer vent, and other similar systems adapted to serve this purpose. There are also air cooled lighting systems to remove heat produced by lights before the air can affect the grow area. If you are using more than 250 watts of lighting, you will probably have to use an exhaust system. If not, you will need a large air conditioner that will run constantly. Your electric bills will be very high. Large commercial operations use industrial exhaust fans that cost several hundred dollars each. An exhaust system should be able to move a volume of air equal to the room size every 3-5 minutes. LED GROW LIGHTS PRODUCE VIRTUALLY NO HEAT !

Humidity: Use a hydrometer to measure humidity if you think your grow area is out of range. A humidifier can increase humidity and a dehumidifier can be used to lower humidity. In general readings between 40-60 percent relative humidity are recommended. The humidity should always be kept below 60% to minimize the chances of mold development. If mold is a problem in your grow room, humidity should always be kept below 50%.


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