I have so good light in my hand and I dont know nothing about it exept it is the best grow light in the world ...
fortunately they all are these days
so if I connect driver to cobs and put the driver with scredriver on minimum without wall watt meter , I am guessing that cobs will go on with minimum power and then when I dimm it with scredriver to maximum can I burn all my cobs ?
that is the version without wall meter...
your cobs wont "burn" as long as you have proper heatsinks. 1212s are rated for over 100W max
So one more question in this subject...
I was told that cobs are best working on 50w but they go to 70w but then the efficenty arent in maximum....
So I am guessing that if I put my dimmer on driver to maximum every cob will recive 70 w ?
50 isnt "best". efficiency will continue to increase as you drop wattage
40 is more efficient than 50
30 is more efficient than 40
20 is more efficient than 30
10 is more efficient than 20
5 is more efficient than 10
etc
but then you have a lot less light. most people use 50W for the citi 1212s as thats a good balance of efficiency and chip utility
So if I want to know exactly how many w I have from the wall I must buy wall meter...
you can do it with a multimeter but then youre dealing with AC on bare wires which is more complex and less safe. the wall meter is worth the money, as is the cheap lightmeter suggested above. the latter more useful for making sure garden is uniform
If I buy watt meter and I plugged my cob fixture to it I am guessing that will show me 200 w for my cob fixture...but how can I know for sure that each cobs recive 50w exactly..
it wont. because youre not accounting for driver efficiency.
200W AC is about 185W to the cob. plants dont care if your cobs are 48 or 53W so dont stress about it. there is nothing "magic" about 50W.
but they go to 70w but then the efficenty arent in maximum....
So I am guessing that if I put my dimmer on driver to maximum every cob will recive 70 w ?
your driver cant give the cobs 70W because it is limited to 1400 mA
And how to connect wall meter with mehanical timmer?
timer can be before or after meter, its just a switch, it doesnt matter where you turn it off