Reply to "Is color of LED dependent on voltage?"

I'll tell you if you solder the flickering thru-hole LED's with 650F, you are very likely to lose 10-15% of them in the process.  I make a flickering firebox board with four of the flickering LED's on it.  When I was soldering them using 600F, I'd have a consistent failure rate of more than 10% of the LED's.  Once I dropped the temperature to 500F, I haven't lost a single LED in the 40-50 I've soldered onto the modules since.