ttystikk
Well-Known Member
Is there an echo in here?*ahem* "This thread is completely bonkers."
![Roll Eyes :rolleyes: :rolleyes:](/styles/smilies/rolleyes.png)
Is there an echo in here?*ahem* "This thread is completely bonkers."
I see your point but at the end of the day, caveat emptor applies here. If people want to go ahead without every piece of empirical data that could be generated with a lot of time/money then that's up to them.@amyg88 , @rayuki It's only a few people who immediately play the victim role when someone doesn't agree (like the starter of this thread). Unfortunately it's a tight nit group which always upvote each others posts and pretend each others word is the ultimate truth even though it's usually clear that it's nonsense.
Unfortunately the people with the real knowledge like SupraSPL, Alesh, SDS etc don't come around too often anymore (if at all) and a few others have turned to sellers and apart from COBkits and Rahz they now mostly advertise/discuss their own products.
He doesn't just "put it out there" though. He spams in just about every thread on the forum that he reinvented the wheel and that people should stop using COBs, strips or boards from other vendors with a whole slew of complete nonsense as reasons why. For instance the other day he posted that we can only see half the light that plants use and that this "invisible light" is somehow super important. Complete nonsense since the visible light spectrum (or even narrower the light emitted from these SMDs) pretty much overlaps with what the plants use. Besides, these SMD's emit exactly the same spectrum as the same SMD's on other boards/strips and COBs.I see your point but at the end of the day, caveat emptor applies here. If people want to go ahead without every piece of empirical data that could be generated with a lot of time/money then that's up to them.
VW has put it out there, if people want to go with it with the info they have then that's their decision. That's DIY.
I dunno man, it doesn't appear like he's making any money on it thus far... maybe it's easier just to ignore it and say who cares... life's too short right?Ah well, we all build amateur stuff in the end. Who cares. In the end it does what we want it to do. Only if he intends to sell this crap then it would be sad, but I'm afraid that "if" is more like a "when".
Like I said, it's much more than that. He's barfing his made up "science" on just about every thread here.As you yourself said right at the beginning of the thread:
I dunno man, it doesn't appear like he's making any money on it thus far... maybe it's easier just to ignore it and say who cares... life's too short right?
So do you.Like I said, it's much more than that. He's barfing his made up "science" on just about every thread here.
Still, when you post a DIY project, you can expect people to offer help when they see you are making mistakes. Why go apeshit everytime someone tries to contribute?
He did it just again on another thread. He posts something incorrect and someone offers a correction plus a thorough explanation of what's going on. Then VW responds like an ass and pretends like it's an insult that someone tries to help and that he knows everything already. Plus the ensuing drama queen barrage of posts which he produces when he's "insulted"/"picked on"/"singled out for being a revolutionary".
Even though what he said was clearly wrong to begin with. Either just stop spouting nonsense to begin with, or at least learn from your mistakes and try to make less and less. He just doesn't get it. That's what makes it so annoying. And he barfs on just about every thread here.
Efficiency of leds is determined by the combination of voltage and current (ie watts). Not just current alone. Better add that you your "knowledge".A person commented without knowledge the capability of the GrowGreen board 200w. Here are two different drivers one a 240h the other a 185h the185h reads 1.81 amps with 208w while the 240h reads 1.94amps with 228w. The diodes in both cases are being driven at optimum efficiency the difference is in the voltage.
Would you mind explaining this further please? Thanks very muchEfficiency of leds is determined by the combination of voltage and current (ie watts). Not just current alone. Better add that you your "knowledge".
What do you assume is "optimum efficiency" anyway?
Thanks very much for that, makes sense. Wietefras: Your post kind of implied that you needed to modify both (I & V) however one determines the other, no?Sure.
Samsung LM561C is designed to provide optimum intensity between 150mA and 165mA. There are a number of ways to achieve this result using constant current or constant voltage. Constant voltage is easier because you can establish a constant voltage circuit voltage using resistors and diodes. Diodes themselves are resistors and have to be taken into account to create a balanced constant voltage circuit. Less efficient than constant current.
Constant current you design the circuit for a target amperage. In a series circuit volts are addative and current is constant. In a parallel circuit voltage is constant and current is additive. The trick is to design a combination series parallel balanced circuit, not simple or easy, without using resistors but the resistance of the diodes only.
Approaches for circuit design are lower voltage lower amps, higher voltage lower amps, lower voltage higher amps and higher voltage higher amps. The most efficient is lower voltage lower amps. The second most efficient is higher volts lower amps.
The second trick is using lower amps to reach that target amperage of 150-165mA per diode. I chose higher voltage lower amps by creating two channels with a forward voltage of 92v at 1050mA 100w. I could have made four channels instead of two at 46v per channel but running them in series would all be the same electrically.
So the GrowGreen 200w board is very efficient runs just as designed delivering 150mA to each of the 384 diodes driving them at or around 200ul/m or PAR of 76,800 per board which is quite high and efficient
Yes, he's working off current alone, but of course that's not how it works. When the voltage goes up or down the wattage changes and efficiency works on that.Thanks very much for that, makes sense. Wietefras: Your post kind of implied that you needed to modify both (I & V) however one determines the other, no?
The problem here is that you don't understand what the word "optimum" means. First of all you probably mean "optimal" since there is no single optimum. An optimal value is a "local optimum" optimized to match a certain set of conditions.Samsung LM561C is designed to provide optimum intensity between 150mA and 165mA.