Planet Tomato
Member
Hello.
I've found a thread(can't recall if it was on rollitup or not) in which a person was modifying a lux-meter to get it to reflect a PAR value, the thread was very long and in the end I was nothing but very confused.
But my reasoning is that if I had a lux-meter and I knew the exact spectrum of my light source(which I do since I have the datasheet for my specific COB LED), then shouldn't I be able to take a lux-meter reading and convert that into a "ball park" PAR value?
I don't know but I can't afford a Quantum sensor and I really, really want to find out some characteristics of my own built grow light. Is a low-cost close-to-PAR meter a pipe dream?
The person in the thread I mentioned had gotten a book of samples from a company which produces light filters and with a lot of calculations(he said) and experimentation he found filter combinations that resulted in sort of a PAR spectrum but in the end he didn't consider it a good solution.
He also changed the actual light sensor in the lux-meter.
That is another option I have begun looking into, finding a light-sensor that out of the box would have a spectrum response close to that of a PAR measurement, according to Wikipedia, "PPF values all photons from 400 to 700 nm equally", that makes me optimistic of actually being able to find a solution for this.
I reckon that I must be far from alone to have been thinking about this, have anyone else thought of something like this and have you come to any conclusion or result?
Regards
I've found a thread(can't recall if it was on rollitup or not) in which a person was modifying a lux-meter to get it to reflect a PAR value, the thread was very long and in the end I was nothing but very confused.
But my reasoning is that if I had a lux-meter and I knew the exact spectrum of my light source(which I do since I have the datasheet for my specific COB LED), then shouldn't I be able to take a lux-meter reading and convert that into a "ball park" PAR value?
I don't know but I can't afford a Quantum sensor and I really, really want to find out some characteristics of my own built grow light. Is a low-cost close-to-PAR meter a pipe dream?
The person in the thread I mentioned had gotten a book of samples from a company which produces light filters and with a lot of calculations(he said) and experimentation he found filter combinations that resulted in sort of a PAR spectrum but in the end he didn't consider it a good solution.
He also changed the actual light sensor in the lux-meter.
That is another option I have begun looking into, finding a light-sensor that out of the box would have a spectrum response close to that of a PAR measurement, according to Wikipedia, "PPF values all photons from 400 to 700 nm equally", that makes me optimistic of actually being able to find a solution for this.
I reckon that I must be far from alone to have been thinking about this, have anyone else thought of something like this and have you come to any conclusion or result?
Regards
