I'm trying to build a small table lamp with a 1 watt led inside. I've got this working with a matching LED driver, however, this driver is not nicely packaged and would require me to create some kind of additional housing:
I would like to replace this driver with a more typical power adapter. The one you plug into a wall to charge your cellphone.
The problem is, I don't really know how to make that work. I know enough to be dangerous, which is why I'm asking this here.
From what I read on the package, the LED driver is supplying a constant current (300mA). So you can connect up to 3 1 Watt LEDs in series.
A basic USB power adapter is, I think, supplying a constant voltage of 5V. So, using a LED calculator and assuming that the LED is 3.3V (see below). I would need to add a 6.8 Ohm resistor in series.
So my question:
- Is it as easy as adding a 6.8 Ohm resistor or is there something more I need to worry about?