red is not necessary, warm/yellow light is fine too. As for lumens don't stress it, if its bright enough that u can read a book but not blinding u then itll be good for the chickens.
how many daylight hours does your area get right now? Take that amount and add 30m-1hr of supplemental lighting daily until you reach your desired total light time (14+ Hours). Up to you whether you want the light to turn on before sunrise or after sunset. I have it set to turn on a few hours...