The absence of any ambient lighting in the room causes your pupils to dilate too much because of the extreme changes on the screen, and this is hard on the eyes.ĭave Napoleone, a Toronto-based system design, and senior technician, with commercial and residential AV installer, Cloud 9 AV, tells Digital Trends that this is thanks to our human biology. In some cases, they can be so bright compared to the surrounding light levels, they can cause eye strain and headaches. The darker the room, the brighter they appear. What people began to realize back when TVs started to invade living rooms across the nation, is that TVs are bright. Power on the lights the next time you want to watch a movie at night and forget about dreaded dry eyes and headaches.Reducing eye strain is helpful, but bias lighting can also enhance image quality too. This gives you the ability to tweak the color and brightness to your liking. Lights of a different temperature will alter your perception of the colors on the screen.Ī quick and easy DIY solution for bias lighting is to use a smart bulb or LED strip behind your TV. This is the industry standard white reference point for manufacturers of displays and content creators. That said, the main feature you're aiming for, as explained by Fitzpatrick, is a light source with a temperature of approximately 6,500k. Virtually any light behind your television or monitor will improve the contrast of the picture at night. Many kits are even USB-powered, meaning installation is as simple as plugging in the USB end of the strip into the USB port on your television and attaching the lights to the back of the television or entertainment system. The number of commercially available kits for bias lighting is only growing, and they range from about $10 to upwards of $100 online. Grays and blacks appear darker when against a lighter background.Īll you need to set up your own bias lighting is a light source placed behind your monitor or television. This works on the same principle as the simultaneous contrast illusion. This is what leads to dry eyes, dizziness and headaches.īy placing a light behind the television, you are raising the average ambient light in the room and reducing the strain on your eyes, meaning you can watch television or work for longer without all the negative side effects.Īs an added bonus, your perception of the contrast on the display will increase. This forces your eyes to work harder and fatigue more quickly than they normally would. In other words, your eyes do not properly dilate for the amount of light they're taking in. Despite the fact that we accurately perceive the screen to be very bright in relationship to the rest of the scene our eyes take in, our eyes attempt to adjust based on the average brightness across the entire field of view and not the average brightness of the screen (or, conversely, the dimmer off-screen area). When we watch television or use a computer workstation in a completely dark or significantly darkened room, we create a less-than-ideal viewing situation wherein our eyes are staring very intently at a small window of very bright light that is floating in a sea of darkness.
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