Hm I'll edit to go more into it, but I thought I was clear on that. i describe the NZXT and Bitfenix kits, where they are good or not. The problem is that they really pale in comparison to 3528s.
Like you should never buy the bitfenix kit because of 3528. It's literally just a small piece of 3528 with an insane markup, there is absolutely no reason to get it. And then the NZXT kit is kinda okay.... but when you really get into it, 3528 is still better. Maybe the 2m kit.... I still have my nzxt kit hooked up but I'm probably going to toss it.
But for quick easy leds, sure, nzxt kit is what I'd recommend.
On the NZXT led strip, the white light is kinda overriden by the blue glow from my fans, there is definitely a white light to it (like the 2nd image), but I think the 2nd image pretty clearly shows the strip is far worse then just some 3528. Literally just having like a 6" strip of 3528 on the top of your case is more lighting then an nzxt led strip set up optimally.
They are specced to run 12v, but they can handle about 13v, and will operate to about 8-9v minimum. This means you can't run it off the 5v rail or off 7v, for lower brightness, but you could use a non-PWM fan control to change brightness (dedicated fan controller or motherboard header).
Forgive me for being a little slow, but I had planned on running some 3528 @ 30 per metre from my cases in built fan controller (3-pin). So When I ramped up my fans speed, my LED's would also increase in brightness. From what you've said would that mean that the lower settings on my fan controller would not light up the LED's? My case is an NZXT Phantom 530, so it has a 3 stage fan controller (possibly 5v, 7v and 12v?).