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28w led Customers Reviews

  • 28W 1400mA Power Constant Current Source LED Driver (85~265V)

    28W 1400mA Power Constant Current Source LED Driver (85~265V)

    Good power supply

    posted by gallimatao

    The 28W 1400mA Power Constant Current Source LED Driver (85~265V)has been under electronic tests in my company and we are obtaining good results.At least for the brazilian standards, the price is good.
    Thank you.
  • 28W 3200K 2800-Lumen 28-LED Warm White Light PCB Board (24V)

    28W 3200K 2800-Lumen 28-LED Warm White Light PCB Board (24V)

    Quick electric test of 28-LED PCB

    posted by MarcoWink

    Compared to small emitters (10W, 20W) on metal board, this one has a much larger area, so cooling is more convenient and less critical wrt thermal conductivity.
    All leds appear to have same light intensity, aluminum PCB will make sure temperature is about the same over the board, which is important.
    Price per lumen, convenient.
    - heatsink/PCB is large enough to enable to run the light without additional cooling till about ~5W (0.25A, 20.5V)
    - I made some quick measurements, the PCB appears to have a Rth of about 4K/W. At 10W end temp of PCB was 60 C, at room temperature (not recommended for permanent use), note that in a ceiling fixture environment temperatures will be higher.
    - Note that when temperature of the leds increases, current increases with same voltage, so use a real current source in stead of voltage source to stay save!
    - you could cut (saw) the PCB if you need another voltage!
    "2800" lumen for 20 USD is good offer, convenient module.
  • 28W 6500K 2800-Lumen 28-LED White Light PCB Board (24V)

    28W 6500K 2800-Lumen 28-LED White Light PCB Board (24V)

    Powerful light

    posted by albertcfont

    pure white and very powerful light. Compact. I'll use it for an aquarium daylight. I'm happy with this LED board but it's a little bit expensive for beien a DX one
    Maybe it could cost a few dollars less, but it covers all my needs
    Do not forget to add extra heatsink, it gets really, really hot!
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