The colour temperature is something that can be accounted for with the white balance, instead it's better to ensure that the LEDs have a good
colour rendering index (CRI). That being said the classic "golden hour" has a colour temperature of about 3500K, so LED's around this temperature might result in photos that need less balancing afterwards.
You also want to think about the type of optic if you're looking for a photography light. Do you want a focused "throwy" beam or something more "floody"?
It's not always easy finding out what the colour temp., CRI, and beam characteristics of a light actually are. Some manufacturers are better at this than others -
Emissar stand out as being very thorough with these details.
Re. waterproofing, it's impossible to tell with IP standards, they're just a measure of whether the device can pass the particular test or not.