I travel a lot for my work as a photographer. For this I'm building a custom full spectrum lamp.
I have no issue running my build with a normal adjustable power supply from my studio.
To be able to adjust the brightness, I build the lamp with a switch to turn on additional led's. Which is why my amp changes from 3,6-4,8A.
Also there is a cooling fan which is meant to be for 5V but it works at 3,5V just fine.
However when traveling I use power banks for everything. So I would have liked to run my lamps off them as well.
Here is where I'm stuck:
I need a rather small and efficient way of transforming 5V into the desired 3.5V (led's work form 3,1 - 3,7V according to the manufacturer).
This has to work with power banks, which usually automatically adjust their output voltage to the device.
Thanks for your time.