During the summer months, you may need to make a compromise between light levels and the optimal temperatures for your plants. Otherwise you could end up over- heating the tops.
Your HID (high intensity discharge)lights will also contribute to high temperatures. This creates high heat in both the growing area and the internal core of your plants.
By raising the lights a few inches you can help reduce some of the heat stress on the
plants. This slight loss of light will do much less harm than the heat.
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