Recent content by evilc66

fenix-store
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    Looking for a "basic" LED primer

    What are those white peg boards called that you attach LEDs to and how do you work with them?-- I'm assuming that you are talking about solderless bread boards. Useful for prototyping circuits, but not much use for high power LEDs. How do you calculate your power? -- Power = Voltage * Current...
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    Problems about driving the RGB LED with PCA9685 PWM controller

    I've used the PCA9685 before, as well as other Diodes LED drivers (not the AL8805 as such, but most all of their drivers use the same pwm dimming scheme), and had them work without issue. Without getting an oscilloscope on the pwm signal, it's going to be tough to see what the problem is. There...
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    Problems about driving the RGB LED with PCA9685 PWM controller

    Pull up resistors on SDA and SCL? Do you have the ground for the Pi, PCA9685, and LED supply connected?
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    Are 3030 SMD LED's really this bright?

    There are a lot of numbers there that seem off. The only 3030 format LEDs that I know that can crank out that kind of output is the Luxeon C. 3535 numbers are really low, as that's the format that Cree, Osram, Semiled, Samsung, etc... use for some of their high power emitters (XP/XT type footprint).
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    First time building an LED :)

    Yes. There are many options for dimmable drivers. One such option is the Meanwell LPF-40D-36. That gets you in a similar current and voltage range, and can be dimmed by a few different methods. They are pretty reasonably priced too at about $23...
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    First time building an LED :)

    Based on the information you have given us so far, it looks like the fixture is split into 3 series strings of 9 LEDs, with each string run in parallel. That will give you about 400mA per LED. Changing to 1W LEDs doesn't make any sense in this case, unless you replace the constant current power...
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    LED bulb question

    I'm curious why you are specifying 500-2000 lumens as the desired output for an LED lamp, when the incandescent versions are typically around 260 lumens (from what I've found so far)? I think you are going to be hard pushed to find a neutral white LED lamp with more than 170 lumens, and that's...
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    21 Luxeon Z LED's circuit options

    Yes, one LDD per string. The reason is that you can't run strings of different length in parallel. Seeing as each string is a different length, a separate driver is required. There is no problem connecting the input power to the LDDs in parallel to the power supply. Just make sure that whatever...
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    21 Luxeon Z LED's circuit options

    So, you can't run unequal strings in parallel. The total forward voltage of each string has to match or else there will be a current imbalance (the lowest voltage string will draw the most current). Best way to approach this would be with a driver per series string. Meanwell's LDD series LED...
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    Alternative to Costco brand?

    Philips, Cree, GE, EcoSmart, etc...
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    Mixing different LED modules on same CC driver

    You can run the XP-Es at 700mA without issue, providing they are kept at a moderate temperature. High quality LEDs like this aren't like the Chinese guessing game budget LEDs. If the datasheet says they can run at 700mA, then they can run at 700mA all day long. As for mixing LEDs, as long as...
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    Led driver

    Most cheap LEDs don't have reverse bias protection diodes on them, so wiring them backwards has a strong likelihood of killing them. Pushing almost double the current through the LED will also have a strong likelihood of killing them. If an LED has a max current rating of 350mA, then that's the...
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    100 Watt LED Chips - Best Quality Brand ???

    The Bridgelux Vero29 is also another great option with arguably better color rendition.
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    Run LED in Series

    Probably the easiest driver to get worldwide will be something like a Meanwell HLG-120H-C1050B. It's a 1050mA constant current driver with a voltage range that is suitable for 10 of the LEDs you are using. You will have to wire them in series to work with this driver (always a better option than...
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    Run LED in Series

    Chances are, while running the LEDs at 12v, the average current that the LED sees is higher than it's rated maximum, putting increased stress on the part causing it to fail. These LEDs will vary a lot from one LED to the next (a problem with cheap LEDs) in terms of what the current draw is for a...
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