Description:
Light, vision & color in architecture, media, etc.
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Engineering Projects | Construction Engineering | Project Engineer
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Engineering Projects | Construction Engineering | Project Engineer The idea for H2find is an online exchange where water and wastewater vendors can search for utility contract opportunities around the world. Now that H2bid makes it possible for vendors to find relevant contract opportunities anywhere in the world, vendors were telling us... more »
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Why do street lights flicker in snowy weather?
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In the UK we currently have cold winds and snow. A radio phone-in got a lot of people talking about flickering street lights. Is there a real connection between bad weather and flickering street lights. If so then how does it work?
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Luxrender and other renderers
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It appears the Luxrender team managed to reverse-engineer all the spectra on my amici spectroscope page. Interesting results: [link] (requires free registration) For some strange reason this data seems to be picking up. Another renderer is making scene efforts using this data:... more »
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Mercury lamp ban?!
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Wiki's article on Mercury Lamp: [link] states that: "Mercury vapor lamps will be banned in the EU in 2015. In the USA, ballasts and fixtures were banned in 2008". What is this? Is anybody on the other side of the Atlantic aware of this ban? What "exactly" was banned and how was this ban implemented? How can one ban... more »
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Drivers Being Hurt, Killed by Snow-Covered LED Traffic Lights
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Energy-efficient traffic lights can't melt snow By DINESH RAMDE Associated Press Writer MILWAUKEE (AP) -- Cities around the country that have installed energy-efficient traffic lights are discovering a hazardous downside: The bulbs don't burn hot enough to melt snow and can become crusted over in a storm - a problem blamed for dozens of accidents and at least... more »
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Early Failure - Trans Atlantic Fluorescents
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Dear All, We're using 2700K 54W T5HOs bought from Europe in linear fluorescents in the US. The fixtures are using Advance Mark 7 dimmable ballasts (2x54W T5HO type) and we're getting black rings on the lamps very early in their usage - a few hundred hours in. Does anyone know of incompatibility issues with these? Is there an... more »
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UL 1572 1988
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If anyone has access to UL 1572, Metal Halide Luminaires, published in 1988, please contact me at the e-mail address listed on my web site. I have a copy of the earlier version, and can purchased the 1995 version, but cannot locate the 1988 version. Thanks.
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What photometry data formats are used in China, India, and Latin America?
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[cross-posted from IALD linked-in group] I have a list of US and European formats which includes IESNA LM-63-02, EULUMDAT, and CIBSE TM-14. There's CIE 102-1994, which Ian Ashdown reports is not used by any lighting manufacturer. But I've no idea what's done in China or India, or in, say, Brazil or even Mexico.... more »
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