Emulating an iPhone torch (LED)

Does anybody know the specifics for matching an iPhone’s LED torch in Blender? I’ve tried searching online, and all I’ve gathered is that the iPhone’s torch is between 12 and 50 lumens. This translates to about 3 watts! Which doesn’t do much in Blender.
I’m trying to improve my photorealism skills, and lighting is a big part of that.
I realise that radius also comes into this, but I’ve compared with a real iPhone and I think 0.25 is about right.
Thanks in advance.