Industrial/High Tech Photography and Photo Gels
I'v been shooting in a lot of locations that colored gels are required to enhance the images. It is very easy to over use gels and get very bad results. Gels are best used in the background to add interest, or to give a certain look. Many companies that product high tech products, do so in a concrete warehouse. This is a great place to use gels to give it a more high tech feel I always recommend keeping the gels off of people, unless they are in the background. You typically want the kin tones on your main subjects to be accurate.