Craig DiLouie

Light is actually made up of colors. For an object to be perceived a certain color, that color must be present both in the object and the light striking it. Because of this, choice of lamp can influence how colors are perceived in a space. This means that perception of objects in the space is, [...]

NEMA’s compact fluorescent lamp (CFL) index reversed a negative trend that dated back to the first quarter 2009, registering a 3% year-over-year increase. Conversely, the incandescent lamps index fell to its second lowest level on record showing a year-over-year decline of 2.2% during the first quarter of 2010, which maintains a three and a half [...]

LEDs Magazine just reported that the Department of Energy caught a fake Lighting Facts label on an LED lamp displayed at LIGHTFAIR. The lamp was manufactured by Greenlite, based in Montreal. The company is not an SSL Quality Advocates partner and should not be using the Lighting Facts label. Be sure to take a little [...]

Excessive luminances or luminance contrasts may also lead to a visual sensation called glare, which, even though it is also light, can impair or disable vision rather than enable it. Glare is categorized as several different types according to its effects. Direct glare is caused by directly viewing a light source, such as a bright [...]

Specifying color quality appropriate for the application is essential. In a high-end retail application, good color quality can make products, especially clothing, appear more vibrant, truer and ultimately more appealing. In an office application, color quality can facilitate social interaction by rendering faces more naturally and thereby helping to create a more productive and appealing [...]

Lighting quality goes beyond task performance to address other needs related to aesthetic judgment, mood and atmosphere and visual comfort, all of which indirectly affect user satisfaction and task performance. The first two needs, often left out of the retrofit process, become primary considerations in a relighting or new construction project, covering patterns of light, [...]

On May 18, LightNOW reported here that Cleveland was considering a 10-year deal giving Sunpu-Opto Semiconductor Ltd. exclusive rights to sell millions of LED lights to the city in exchange for the company making Cleveland its North American headquarters, creating an estimated 350 jobs. The proposed deal naturally irritated GE Lighting, which is based in [...]

One of the most important functions of a lighting system is to support visual performance by ensuring appropriate visibility of tasks and objects the designer wants seen. The human eye can adjust to a wide range of light levels, including about 10,000 footcandles on a sunny day to about 0.01 footcandles under full moonlight. As [...]

NEMA’s Lighting Systems Index (LSI) increased 1.1% on a quarter-to-quarter basis during the first quarter of 2010. On a year-over-year basis the index posted a similar increase of 1.2%, marking the first time since the second quarter of 2006 that the LSI has registered an appreciable gain compared to the same period a year ago. [...]