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Visually, halolight only extends the bright picture area to a new abrupt edge, so I would think the Philips thing with a gradual reduction in brightness away from the picture is better. Also, you have to remember that halolight was introduced when only B&W image orthicon cameras were in use, which had only the roughest gamma correction by running the exposure beyond the "knee". This means that the brightness contrasts between objects in the image were not very true to life. The effect of halolight to some extent was to make the image appear more contrasty to the eye, which may have been good on some programs. Applying that to a modern HD system, which should have proper tonal rendition to start with, is somewhat suspect. Anyway, a properly produced program is judged for tone and color with a master monitor that is viewed against a neutral, low-brightness background (don't recall the exact percent of image highlight brightness, but let's say 10%). IF the Philips is set to produce a constant low level neutral background, then it will show you what the program source was supposedly set up to look like. The changing-color idea is more or less a gimmick effect; nevertheless, you may subjectively prefer it even though it's not what the program producer was aiming for.
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