but calling it a crap design by someone that doesnt understand what they are doing is totally subjective, thats just your feelings, not the truth.
The original post, oh what a long time ago it was, asked what assumptions the original designer had made. He asked if it was some consideration over the total thermal energy or something. When you looked at it there was no such consideration, in fact all that had happened was he had looked at the piceved brightness of the LEDs for differing pulse widths. I consider that a crap way to design anything. It shows no understanding of what is actually going on. It is common to see such crap designs at places like instructables. It is a result of either ignorance or a missunderstanding about peak verses continuous current.
Now you might want to replace the word crap with some more politically correct phrase like differently correct but that is up to you. I feel there is little subjectivity with the words I used.