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Just my opinion here- I've never heard of any manufacturer or Chinese distributor that rates their bulbs in "classes." On the chip level, you have binning, but I've never seen anything on the bulb side. I suppose it's possible, I've just never seen anything like that.
The differences are not in a QC selection process. It simply depends on the quality of components used and the quality of assembly.
You either use LED chips that are $.20/ea or knockoff, low-grade LED chips that are $.03/ea. You either use brand-name, quality resistors and caps that are within tolerance and spec, or you use cheap knockoffs that may be out-of-spec. You either program your own chips, or you buy them in bulk from someone and make them work (sort of) for your application.
Then, you either have trained staff that knows what a good solder joint looks like, or you throw a soldering iron into the hands of a new guy and have him start cranking out low-grade bulbs. You either have a newer SMT line with automated capabilities, including automated inspection, or you're putting together everything by hand, which leads to all kinds of quality issues.
You don't make a thousand then decide which ones are good and which ones aren't. You couldn't even inspect most of the circuit one they're assembled, so that would be impossible.
I don't mean to start an argument over it, but that's just not how electronics are made. There may be a distributor or trading company that is doing the "class" system themselves but when you're manufacturing directly, you make them at a specific level- you don't just happen to get "class A" bulbs. It takes good design, careful inspection, and uniform processes.
Again, I don't know how every distributor sells their bulbs, but if a seller is offering a newer bulb that looks like one of our designs, it's a knockoff of a product we originally designed and developed, whether in-house or by sending designs and specifications to one of our manufacturing partners.
The differences are not in a QC selection process. It simply depends on the quality of components used and the quality of assembly.
You either use LED chips that are $.20/ea or knockoff, low-grade LED chips that are $.03/ea. You either use brand-name, quality resistors and caps that are within tolerance and spec, or you use cheap knockoffs that may be out-of-spec. You either program your own chips, or you buy them in bulk from someone and make them work (sort of) for your application.
Then, you either have trained staff that knows what a good solder joint looks like, or you throw a soldering iron into the hands of a new guy and have him start cranking out low-grade bulbs. You either have a newer SMT line with automated capabilities, including automated inspection, or you're putting together everything by hand, which leads to all kinds of quality issues.
You don't make a thousand then decide which ones are good and which ones aren't. You couldn't even inspect most of the circuit one they're assembled, so that would be impossible.
I don't mean to start an argument over it, but that's just not how electronics are made. There may be a distributor or trading company that is doing the "class" system themselves but when you're manufacturing directly, you make them at a specific level- you don't just happen to get "class A" bulbs. It takes good design, careful inspection, and uniform processes.
Again, I don't know how every distributor sells their bulbs, but if a seller is offering a newer bulb that looks like one of our designs, it's a knockoff of a product we originally designed and developed, whether in-house or by sending designs and specifications to one of our manufacturing partners.
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