Originally Posted by wjell
Be careful with those pads. I did not realize it at the time but the base has electronics built into it. From the vendor:
Message from Triad R V Parts LLC:
"The socket has a mini-driver that allows the current to be lowered to keep
from hurting the LEDs. The most they could handle would be 8 volts."
You need to work with people who know the details. I would not trust eBay/China.
Its most likely a case of giving the consumer more information than they need to know. These SMD LED's are 3v each and are "wired" in series in groups of 3. (9v total). They need a resistor in-line to reduce the current that runs through them. I'd be more worried if there were no resistors there!
I work in the LED lighting industry so I know a little bit about LED's. But more importantly, I work with other guys that know EVERYTHING about LED's...
Let me share a couple of photos I took when I was making my mind up about these cheap lamp modules made in China...
Here's where I removed the adhesive pad to have a look at the back of the PCB.
I also wouldn't worry too much about goods made in china. Take a look around the room you're in now. I'd bet 90% of the electronic goods surrounding you were made in china or have internal components that were made in china. Its the quality control that I'd be concerned about, and based on the units I've received, all of them were built to a pretty good standard. So for my needs, I'm happy with them.
But yeah, I had to be convinced to. I bought ten bucks worth and I messed around with them. I brought them into work and showed them to a couple of my electronic engineering friends. We ran a couple of tests on the modules AND we even ran them 24/7 for a couple of weeks. In fact, I think they're still running. (I need to check that on Monday... lol).
I was only interested in wattage and light temp. The 3 watt, 3000k result was good for me. One of the engineers commented that he was impressed with the "lumens per watt" output. Suggesting it was respectable considering the cost of the unit. I was only interested in the inside of my camper being lit with nice warm light for very little watts so I wasn't paying attention to any other details... lol