Solar deck lights use a photocell, or PV panel, that charges a Nickel-Cadmium battery during the daylight hours.
Light-sensing thermostats have a photocell embedded inside which tells it to lower comfort settings if the lights decrease and raise the comfort settings if an increase in lighting is detected.
What you get for the extra money is: binocular vision, built-in photocell, a lightweight set-up, stereoscopic vision, and more.
In addition, it uses an advanced photocell that cuts off the flow of CO 2 during darkness, while still allowing fan operation.
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