DX  » view all 28w led » 28w led

28w led

You can buy cheap 28w led from us. DX is an E-commerce online retailer situated in China with more than 100,000 cool gadgets with free worldwide shipping. We try our best to make your shopping experience stress free, so you can have the best shopping experience available.

28w led Customers Reviews

  • 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.
  • 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.
  • 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!

WHY CHOOSE DX.COM?

Get great weekly deals and offers like: Collections