Recent content by primuspaul

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    10W LED chip on 7W LED driver?

    Good. I heard reports of driver "resetting" resulting in an annoying flicker rather than a dimmed, but constant LED glow. I was actually trying to save $ by getting a cheaper, lower wattage driver and at the same time increasing LED chip life by reducing power/light/heat. I guess I'll try it...
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    10W LED chip on 7W LED driver?

    What happens if I hook up a 10W LED chip to a 7W LED driver? The voltage of the driver is within the specs of the LED chip (12V), but obviously the driver is underpowered. I'm thinking one of two things will happen, but don't know which: 1. The driver will simply provide insufficient...
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    Heat sink size for 10W LED chip?

    What sort of heat sink would I need for a 10W LED chip? Assume this is a heat sink without a fan. Also, would it make more sense (price-wise) to underdrive an LED using a constant voltage power supply (say by running a 12V chip at 10 or 11V) and simply use more LED chips to get the same amount...
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    heat sinks / Can a 12V LED chip be installed directly into a car?

    Could you expand on this? I know adding some light colors (like blue) or adding strobe lights can be illegal, but I have not heard of DIY repairs being illegal, which is what I want this for. If I have a headlight or taillight burn out, it's comforting to know that I can fix it with superior...
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    heat sinks / Can a 12V LED chip be installed directly into a car?

    What spec diode? The led chip is 10w.
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    heat sinks / Can a 12V LED chip be installed directly into a car?

    Can a 12V LED chip (the ones sold from China for $0.80 / pc) be installed directly into a car? Obviously the risk is from overvoltage since car batteries can supply anywhere from 11 volts when the car is off and the battery is powering multiple accessories (or one big one) to 14V when the...
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    DIY low power light from LED using 120VAC

    Could you expand on this? What sort of resistor am I looking for? It's a fixture designed for a 12V LED, but with a driver that provides 24-36V. I only have 1.3D-13 NTC Power Thermistor Inrush Current Limiters.
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    GOOD LED Brands?

    I buy no-brand stuff from China and have had about the same luck as you had. The only exception being that if you buy no-brand stuff, there's a small chance you'll run into downright "counterfeit" bulbs where the batch has a close to 100% failure rate. Otherwise, you'll always have a chance of...
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    DIY low power light from LED using 120VAC

    Well, I tried it with a 12V wall wart and it produces plenty of light for what I want (a night light). I even added a plastic cover to make it a bit less intense. Before attaching it, I ran it with no heat sink at all for a few minutes and it was barely warmer than room temperature when I felt...
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    Chinese selling "overdriven" IP65 units?

    Well I got it working for a little while with a bigger LED chip I had lying around. I think this one is rated for that voltage, and it worked for 20 minutes straight, but I doubt the paste seated correctly on their excuse for a heat sink and don't expect this new chip I put in to last long...
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    Chinese selling "overdriven" IP65 units?

    I have a cheap IP65 LED floodlight (10W) that recently burned out. Before that I noticed the case was getting quite hot. I finally got around to opening it up and saw that the LED chip was indeed a basic 10W chip (presumably 12v). I took a look at the sticker on the driver and saw that it was...
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    DIY low power light from LED using 120VAC

    I understand what you're saying and completely agree that that is the right way to do it. I was just wondering what would happen if I used the constant voltage PSU instead to send 12V through 2x12V chips in series (6V a piece). I already tested it and know that there is sufficient light produced...
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    DIY low power light from LED using 120VAC

    What is the disadvantage of using something like this with 2 x 12V led chips in series? https://www.ebay.com/itm/AC-US-Plug-To-12V-DC-Car-Cigarette-Lighter-Converter-Adapter-90V-240V/253284028430 It's 12V0.5A, which translates to 6W. The 12V chips will split the voltage, getting 6V each. At...
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    DIY low power light from LED using 120VAC

    I was thinking about a 500ma 120 to 12v converter and 2 12v chips in series.
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    DIY low power light from LED using 120VAC

    I have a low power "floodlight" type light I use to provide some ambient light to a room. It's a 10W LED, but unfortunately is too powerful for what I want. It also heats up quite a bit, which I can tell from the heat sink/enclosure. I have some spare 12V LED chips and was wondering if I could...
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