I don't know that it was an update...I think it's just how the program is built and how RAW files are read. But then I was always taking pics of the other tank under halides and only ran into issues taking pics under these blue LEDs, so I could be wrong if this just recently happened for you. The explanation that I came across was this:
Lightroom processes the image according to the RAW data stored in the image file. When you make white-balance changes in camera, the settings DO NOT apply to the RAW image data; the WB setting on your camera ONLY effects the JPG preview/thumbnail, and the actual full-size JPEG file (if you choose to take one). So basically, when you import the RAW image into Lightroom, the first thing you see is the jpeg image preview with the corrected in-camera white balance...but then Lightroom processes the RAW image data, and you revert back to a very blue picture. It sucks, and there is no solution in Lightroom. You can do things like adjust each image after import, change your import settings, and even set your "in camera" default settings within Lightroom...but the huge limitation is that the sliders in Lightroom don't allow for enough adjustment of the image to get the correct color rendition back. Amazingly...the small processor in your camera actually has more capability than the programming built into Lightroom, lol.
My workaround has been to shoot in RAW+JPEG...which I always do anyway. You still get a high quality image, but you're a lot more limited in how easily and "cleanly" you can adjust the images on the PC. Photoshop did an OK job editing the JPEG...but clearly I could've used some help with adjusting the highlights and shadows independently in that last FTS.