soldering 0603 LED on wire

this video is part of a project where I used small LEDs
I used enameled copper wire and low-temperature USB soldering iron from eBay for $5
it has low enough temperature so it will not damage LED (my other soldering iron have a too high temperature which burn plastic on led) so this is a very nice and cheap option if you don't have soldering iron with variable temperature

whole project on Instructables:

my playlist about this project:
instructable:

[HTrntrs]

Bro, my leds are square shapped, they don’t have any sign +\- terminal
On the back, what do I do?

[gottisttot]

i have 30W solder and wire awg30 is ok for small led?