You usually need to light your coloring environment and not grade in total darkness, but you also don’t want the light sources to be visible in your line of sight. Being able to see the actual light sources (bulbs) can throw off your eyes’ “white balance” just like colored paint can. The bright source in your vision can also make your grade off on the brightness end.
The best solution I’ve found for this is backlighting. Since I was on a budget, I bought a set of 4 LED lights from IKEA (more on that in my next post). To keep them our of sight, I hid them behind the stands of my two monitors, and behind the speakers on either side. This casts a nice “up-light” on my gray wall that I posted about last time:
In my case, the lights I bought had a long cord with a switch on it, so I looped and taped the cord under the desk so that the switch is taped just under the edge of the desk where I sit, and easy to reach. Again, a great, low-budget solution.