Can anyone recommend a good book on the topic (video lighting)? Clearly there's a bit more of a learning curve that I anticipated.
Read the bible.... "Set Lighting Technicians Handbook". Until you understand all types of light, you cannot sit down and talk about experience with one type of light, because you have NO reference.
LEDs were never meant to have punch. They are designed for headshot type videos where your crop is so tight that you can move the light in close. Most of the newer LED panel types these days carry the diffusion plates that will soften the light up and make it more pleasant to look at.
In regards to matching up lights... there is absolutely no rule about that. In regards to post, well... if you chose to mix lights in the first place, you probably have a reason and wont need to match them up in post.
I kinda like a 3400K/4000K indoor setting, light with 3200K lights and have the daylight do color contrast in the background.
Each light serves a diferent purpose.
Oh and gelling... gelling LEDs is a lot different from gelling tungsten, flour or HMIs. The color spectrum is still not perfect and gelling could create problems with the already present spikes in the spectrum.
But I would just test the lights rigth away, make sure they match up. If not, then return the crap and get a new set.
Regarding power.... yeah, proper batteries for LEDs are expensive. They will, including charger, set you back as much as the K4000 ligths. But only needed if you are doing shoots where you can't draw power.