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Posts : 76
Join date : 2011-06-28

Backlight your TV Empty
PostSubject: Backlight your TV   Backlight your TV EmptyWed Aug 03, 2011 3:37 am

Watching a large TV in a dark room can cause a lot of eyestrain. By placing a simple light behind your TV, you create the illusion of depth, resulting in less eyestrain and a more pleasant viewing experience.

I know you've been there: you're five hours into The Lord of the Rings marathon (watching the extended versions of each movie, of course), and your head begins to hurt. Your eyes get tired, and you can't understand what it is about those Uruk-Hai that's tiring you out. Well, it's not the movie; it's the lack of lighting in the room. More specifically, it's the lack of depth perception that the darkened room is causing.

When lights get dim, your television begins to "fade" into the back wall. Eventually, as lights go almost out (the optimal viewing environment), your eyes can no longer separate the picture on your screen from the wall behind it; but these two objects aren't the same distance away. If you're still unclear as to what I'm talking about, think about a camera trying to focus on two objects that are different distances away. Just as you seem to focus on one object, the other starts to grow blurry. That is what's happening to your eyes in a darkened room, and eventually, it'll begin to hurt. Your eyes need some way of distinguishing between the wall and the picture, which allows them to focus on just the picture, reducing eyestrain.

The easiest way to accomplish this is to backlight your television. Key to determining what light to use is the color-rendering index (CRI), which measures light's ability to render pigments (perceived as color) according to a prescribed standard. Most lights for your house don't even take CRI into consideration, so just grabbing a lamp and sticking it behind your TV won't help much--in fact, you won't even see a CRI rating on most bulbs. However, you can make a judgment based on the light's Kelvins (K).

Ratings of 5,000K and higher are referenced to daylight, based on different times of the day; 6,500K is best for a home-theater application. A white light rated at 6,500K will exactly match the white on a correctly calibrated TV set. You can pick up a 6,500K light from Home Depot, Lowe's, or Sears. Look for one of the following items:

Westinghouse 18-inch 6,500K 94CRI 15w T-8
Philips Daylight F20T12/D
Westinghouse F15T8/FS 18-inch 6,500K 48CRI

Or, if you're a serious home-theater nut, check out [You must be registered and logged in to see this link.] It carries incredibly accurate 6,500K, 98CRI lamps made just for this application.

Place this light directly behind your TV set. You don't want the lamp visible, and you'll find the minimal light generated is not at all bothersome; in fact, as the hours roll by, it'll be quite pleasant.

Some nice side effects

In addition to reducing eyestrain, good backlighting often increases the perceived picture quality. Your eyes have a much more difficult time determining color without any light source. In fact, this is why colors seem so bright when you walk out of a dark room into daylight: your eyes have lost their color reference and have to adjust. The backlighting will provide just enough light for your eyes to get their color reference, and you'll find that pictures seem a little crisper and colors more vivid--quite a fringe benefit.

My light is too bright!

All the benefits in the world won't make you happy if your TV is small and your light is too bright. Suddenly, your lack of eyestrain is coupled with what appears to be an odd glow emanating from your TV; this isn't good. To lower the light level without losing the benefits, just place some tinfoil over the edges of the light and work your way toward the center of the lamp until you get acceptable light levels. The foil won't melt, and you'll get the same effect

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