Overdriven and Underdriven Lightbars - Why cheap can be bad (1 Viewer)

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Apr 15, 2016
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Canberra, ACT, Australia
So this is something that I see a lot of people do is buy cheap and crappy lightbars.

One thing that people don't seem to understand is why their cheap lightbars seem to be brilliantly bright at first, and then they seem to fail and fall within 12-18 months with LED's dropping out.

One of the biggest reasons I see for this is because a lot of manufacturers run overdriven chipsets, so in simple fact, it works as follows (Broken down rather simple):
  • Users want a 50W lightbar
  • They want 10 x 5W chips
  • 10 x 5W chips are expensive
  • 10 x 3W chips are cheap
  • But you can set the drivers to give them 5W of power
  • The bar will draw 50W of power
  • Boom! You have a 50W lightbar
Now it is a tad more complicated than that, however this is one reason why cheap lightbars will sometimes be very very bright at first, and then they will literally burn out within a few months.

On the flip side of the coin, you get a lot of manufacturers that give very good bars out that are underdriven
  • Users want a 50W bar
  • 10 x 5W LED's have a half good lifespan
  • We want to make the lifespan better
  • How about we use 10 x 7W LED's
  • But that will make it 70W?
  • No, we drive them at 5W instead of 7W
  • Sweeet, this thing will run cool and last for years!
If that still doesn't make sense, I did make a video:
 

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