Originally Posted by
NanoRex
A constant current LED driver dynamically converts the input voltage into a voltage at which the current drawn by the LED is equal to the drive current of the regulator. In this case, the CF's driver drives the LED at one amp.
The trade off is space and cost. The choke (the giant grey thing) is part of the current regulator, and as you can see that takes up a lot of space. The CEx has two regulators for the other two colour channels, and it's about half the size of the CF.
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