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You can reduce power consumption and components needed greatly, by using PC case fan and LED lighting strip. A 120 - 140 mm PC case fan with good airflow rating will circulate air better. While only using 12v. Same goes for the LED strip. They're flexible and some come with an adhesive backing. But I recommend mounting them with quality 3M double sided tape. Also, some LED strips have an RGB feature. Allowing you to adjust the blue and red levels needed. Since plants primarily absorb light from the red and blue spectrum. To control these components, you can use a cheap arduino or raspberry pi zero if you like. Allowing you to program on/off cycles. Also would allow you to add monitoring sensors or switches to control a water pump.
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