Quick HPS warmup appearance question
Observing various HPS installations, I've noticed that some lamps turn their yellow-orange sodium color very early in warmup, whereas other lamps initially look white like a phosphored mercury or a...
View ArticleLux Live, London, 9-10 Nov 2011
Thought this might be of interest to UK readers... Lux Live 2011, Earls Court Exhibition Centre, London, 9-10 Nov 2011 http://www.luxlive.co.uk/ -- Andrew Gabriel [email address is not usable --...
View Article70-watt MH temporarily stopped working--overheated ballast?
Quick question: Do general-purpose-lighting HID ballasts typically have a built-in thermal protection device of some sort like some fluorescent fixtures have? I was operating a 70-watt metal halide...
View ArticleTCP TruDim dimmable CFLs
Has anyone heard of these? They look quite interesting. https://www.1000bulbs.com/category/tcp-trudim-dimmable-cfl-compact-fluorescents/ Spec sheet: https://www.1000bulbs.com/pdf/TCP-TruDim-specs.pdf...
View ArticleWiring mishap?
I'd like to think that I'm reasonably cautious and safety-conscious around this stuff, but despite my best efforts it sometimes just seems to hate me. Today I turned on my 70-watt M98 metal halide...
View ArticleConversion to color temperature
Can anyone tell me what colour temperature X=0.45, Y=0.41 equates to? (It comes from the specification of a warm white LED). -- Andrew Gabriel [email address is not usable -- followup in the newsgroup]
View ArticleCFL equivalance wattage changes
I notice a sudden recalculation of the equivalent filament light output ratings on the packaging of all CFLs in the shops in the UK. They are now mostly claiming almost the 1:4 ratio I've always...
View ArticleRe: Fluorescent tubes mounted vertically
T5 technology employs a "cold spot" design which helps to maintain proper mercury vapor pressure while operating. This is done by mounting one electrode deeper within the lamp than the opposite one. In...
View ArticleEnergy conversion efficency of lamps
Hi all, in Wikipedia and many other places the efficiency of artificial light sources, e.g. incandescent bulbs, is stated in per cent, and thus treated as energy conversion efficiency. Here, the...
View ArticleeuroLED, 13-14 June, NEC Birmingham, UK
One of the exhibitors just emailed be about this event, so thought I'd mention it here in case anyone is interested. No idea how good/bad/ugly it is, as I've not been before. http://euroled.org.uk --...
View ArticleQ: glowing "paper" flat panels...
Hello Group, i like to know what the product name of the flat bendebable glowing panels is called. i saw it on Light + Building in Frankfurt 2002 they where glowing and it was possible to get it in...
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light fixture ratings 110V bulb tranformer and 220V source
Hi I live in Asia and have 220V power. Light Bulb choices are limited in the developing world and I would like to have natural light spectrum lighting during the winter when there is little natural...
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Measuring Color Temperature
Moin moin, is there a way, to ,,measure'' the correlated color temperature of a light-source (LEDs) without special equipment. GMC, Minolta etc. costs about 1k Euro and above, for a non-profit-job a...
View ArticleControlling Physical Model Lighting from a Digital Model
Looka this: <http://lmnts.lmnarchitects.com/interaction/ledstagelighting/>. Very cool.
View ArticleDetectable Ballast Interference
Sorry for the Xpost. There is an ongoing argument about ballasts giving off detectable interference. https://www.icmag.com/ic/showthread.php?p=3808279#post3808279 Is there a way to ultimately answer...
View ArticleJohn Waymouth Collection at the LRC
A short while back I mentioned that John Waymouth had donated his extensive lighting technology literature collection to the Lighting Research Center at RPI, and that they would make the collection...
View ArticleSpectral Distribution Glasses
I'm cleaning out some old piles of paper in my office and came across a pair of spectral distribution glasses that Philips gave out at a Light Fair or IES meeting, probably around 2000, based on the...
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