I would do it using a transistor like a MOSFET, but the estimated high current makes it impractical due to too much heat.
We have constant current LED strips too (like this one ). We can leave the power LEDs out and use only constant voltage LED strips so we can adapt to both situations, whichever is the better solution.
That strip seems to be a mix of common CL resistors and a tiny linear regulator (I don't see any inductors).I would still call this a constant voltage strip (with a little bit of regulation).I don't see any voltage window limits in the specs where the regulation would still work or fry the linear chip.This strip should be PWM-ed low-side with a locic level mosfet.There are many low voltage CC LED drivers available for the Arduino,but they need to be matched to the LED you're driving.Give us a link to the 'other' LEDs you want to control.Leo..
What kind of logic level MOSFET can deal with that?
that means that you can switch at least 15 Amperes without a heat sink
at least I know what to look for when choosing a MOSFET
Well I only get 182oC above ambient.8 * 8 * 0.046 = 2.9W so 2.9 * 62 = 182oCBut yes in general you should not run the junction much above 120oC for a decent life. This ofcourse assumes no heat sink.Excellent.