Black dogs become nothing but a black hole and white dogs? They become a sea of white, like snow blindness.
Because we cannot see anything but a solid blob of color, there is no way we can see scissor or clipper lines, and as a result, the quality of our work can and WILL Suffer. We also end up with eye strain which can result in headaches and stress which make our lives much more stressful, and we are already stressed enough in many cases.
I know that lighting can be complicated and hard to install and in some cases nothing we do above our heads actually helps us see any better.
Artero used to have a grooming arm with lights built into it in their catalog (I don't have a new one to see if they still do) and I always thought that made sense. Close overhead lighting would make more sense than CEILING overhead lighting because there would be no shadows falling onto the dog.
I have pondered t his and tried to work it out in my head for years as to how to duplicate this easily and not long ago, while looking for an overhead lighting system for my kitchen sink I found these under counter lights:

The cords posed a small problem, but nothing I couldn't tackle with cable ties.
I put a light (as pictured above) about 4-6 inches above the table as well to light the feet and underline of the dogs. I know, I know, you are saying "WAIT! I need to adjust my arm!" but we use Groomer's Helper Loop adjusters, so we never have to move our arms up or down. Problem solved. The cords, when secured correctly do not interfere with the use of the Groomer's Helper clamp either. (as seen in the photos below)
Notice the color differences? Isn't that crazy?!?!?!?!
The last photo was taken at the far end of the table with half the dog lit up and the other half in shadow. Neat contrast don't you think?
You can find the lights I used by following this link: LIGHTS. This set has a dimmer switch which I opted not to install because a slight bump would turn it up or down or even off, so instead I made a decision to separate the set and light two tables.. You can get the kit without the dimmer switch here at this link 3 LIght Set. 2 lights on the arm overhead and one at the feet is what you need and a 3 light set will be sufficient for one table. Plug into a power strip or an extension cord and "Let there be light!".