I found this "Plant Grow LED light" circuit on the Internet and I wanted to know if: (Please don't feel pressured to answer all my questions. You can just answer a few only if you like.)
- this is correct?
- the best way to build this circuit?
- is the cooling fan necessary?
- what is the heat threshold necessary to implement a cooling fan?
- how can I determine the amps correctly of 12 volt power supply if the label on the power supply is wrong? I use a 120 volt outlet here in Toronto, Canada.
- I have old 12 volt power supply but it gets too hot to the touch. Should I discard that?
- Is R1 0.20 ohm resistor the same thing as a 20 ohm resistor?
- How can I add a switch with a potentiometer? What kind of ohms?
- Could a 555 timer be used to increase the amount of LEDs to double by alternating 2
separate circuits back and forth - on and off? This would appear to be 20 led light on simultaneously but really a set of 10 go on while the 2nd set of 10 turn off and then in a split second later this reverses the 1st set of 10 turn off and the 2nd set turn on. And so forth.
I'm wanting to grow Orange Pixie Tomatoes.(I bought the seeds from Tomato Grower's Supply Company I'm just a customer, have no endeavor with them, just in case your curious about that tomato cultivar.)
The circuit to be built would hang 4 inches above the plant. I'm scared that if I purchase a 50 WATT(includes a cooling fan) grow light this would catch fire when I'm sleeping or away from home. Thus I thought a 12 volt circuit would be safe.
Later I would like to show my final draft which will include white LEDs to produce better nutrition in the tomato plant. Many grow lights now come with between 10.66% to 25% white lights to produce carotenoids in the plant as a health benefit I believe. So thats one mistake the circuit has.
This is my first time here in posting. Thank You for reading this.