I used 3mm warm white leds for the bottom hull lights, they had a lot of variation in individual unit temperatures, that's very bad in a photograph. To the naked eye warm looked great, but eventually I changed them all to cool white. They're a little blue but in camera closer to daylight than the warm ones and they were all the same exact temperature.
I did not know fiber optic strand expands when heated, is that just a certain brand or is it common to most brands? Looking forward to seeing how this will turn out. Maybe some extreme detail shots below the hull after the strands are in place? Ot would be great to see the lit pits closely. I might do my next Falcon with fiber, too.