Originally Posted by GeorgeAB
You are not missing a thing, other than the fact that we also recommend to anyone interested in viewing environment solutions that they consider incorporating a neutral colored wall behind the display.
Physics is a good thing, isn't it?
In my experience "most entertainment environments" are maintained by consumers who don't really care that much about image fidelity and likely would never go to the trouble of considering a bias light of any color.
Sorry, but I disagree. Most of the people that you describe probably watch with one or more lights on in the room. I know all my relatives do. This is a form of bias lighting. Improperly placed, yes; but, bias lighting none the less.
Ends up, my Mom was on to something when she forced me to watch our B&W TV with some light in the room.
Many folks who might be inclined toward better imaging live in rental properties or new homes that have white walls or slightly off-white.
And if they are neutral white, a D65 will work as advertised, if not, it won't.
Some hobbyist/videophile types start out with high CRI 6500K backlights and change the wall color later.
I certainly did. However, I believe the number of folks who have this capability to be small. (not a lot of WAF in a neutral Black, White or Grey (BWG) wall, much less room, carpet and furnishings)
I have advised many inquiring about our high-dollar D65 professional model not to bother with the extra expense unless they had a truly neutral surround behind the display. .... However, the SMPTE recommendations pertaining to viewing conditions devote much more discussion to preserving accurate color perception. That discussion includes providing ambient lighting as close as possible to D65 and a neutral colored surround. Incorporating these elements will result in better imaging.
Yet this is not what you suggest to your LOW dollar customers, eh?
Worst possible choice? Surely you're not serious. Yes, I know you're name isn't Shirley.
First, Shirley is just a nickname I picked up when I was drunk one time. But that is not important right now.
Second, I'm very serious as I believe you are. All of your discussion above talks about color accuracy. If my walls are green, using a red+blue (cyan) light would make more sense to attempt to get a more neutral color from the reflection than a D65 light.
Put another way, using a D65 light will reflect green. Can't I use any white light to do that? Why would the green reflected by a D65 light be better than the green reflected by a halogen or incandescent or rope light?
I think you said it best yourself (paraphrase): If the user is not going to re-paint their room (or at least the surfaces they plan to shine this on) to a neutral BWG color scheme, don't bother with D65 lighting as the expense is not worth it. I think that is good advise for everyone, no matter their price range.
To the original poster: I'm sorry for high-jacking your thread.
I hope you find the discussion useful and if you have a neutral white, black or grey wall behind your TV, try a D65 light. If not, I believe the other suggestions above will work at least as well.