I cant say for sure ... this is the first time I got specific about the 'color' of my lights ... I know this sounds wild, but I must have the world's best luck, because since 1977, I just bought the cheapest flouro tubes I could find, I would guess they were all 'blue' spectrum, these reds' look differently than I'm used to ... here's a real kicker: I have only had ONE male plant develop in my life ... so far ... hope I don't jinx myself ... this is also the first time I ever bought seeds, I always just used the seeds found in half-decent bags of street weed, only had an indica one time, all others just happened to be sativas, judging by their looks ... but I always had quality smoke from those grows, just not big on yield ... :smokin: