If you're happy with what you're seeing now, why mess with it?
A few reasons....
First, Gregg Loewen, one of the top calibrators in the country, sent me a backlighting
kit with the recommendation to use it. Unfortunately, I had a pet destroy it and I never
got to use the kit.
Now I have a rather bright display. I prefer it bright, but I admit, the brightness does
seem to cause a little eye fatigue. Reading the reviews on Amazon, it seems that bias
lighting greatly improves the overall viewing experience.
If you have the time, you may be surprised what you read...
The lights are rather cheap. I would buy two sets.
BTW, spoke with Gregg on the phone a week ago -- didn't even mention bias lighting --
and he brought it up in conversation saying it would be a good idea to use to raise black
levels even further.
Read some of those Amazon reviews and you'll find owners commenting they got better
black levels (not that I am unhappy with the black levels right now)