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Philips' solution is to combine two blue and one red element, but use a green phosphor filter to convert one of the blue LEDs to green.
ENGADGET
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In the northern English city of Sheffield, even bus shelters now sport green roofs to filter pollution.
BBC: Time to leave the comfort zone
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The theory is that this green technology will filter down to passenger cars.
ECONOMIST: Sports compete to save the planet
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The first permanent colour photograph was taken by Thomas Sutton who was working with Clerk Maxwell and is a composite of three black and white pictures, each one taken through a red, green or blue filter.
BBC: Pioneering colour photography
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They photographed a Scottish tartan ribbon three times, once with a red filter, once with green, and once with blue.
FORBES: GPotD: Maxwell's Tartan Ribbon
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Instead of having spectacles with a crude red filter for one eye and green for the other, the Real D system relies on circularly polarised light with one lens polarising the light to the left, and the other to the right.
ECONOMIST: Animation takes on a whole new reality
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Each disc is covered in a transparent plastic coating (either blue, green, yellow or red) which lets daylight filter through.
WSJ: Daniel Buren's Bright Periphery | 'Excentrique(s) Travail In Situ' at the Grand Palais in Paris
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Then they developed the pictures and loaded them onto three different projectors, one with a red filter over the lens, one with green, and one with blue.
FORBES: GPotD: Maxwell's Tartan Ribbon
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Beyond that, it was fascinating to see seeing what Detroit automakers are doing to reduce their carbon footprints, like using green roofs that insulate their buildings, porous pavement to filter rain water and even solar panels to help power their facilities.
FORBES: An Eye-Opening Trip To The Motor City
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Colour is added by using three separate arrays, each fitted with a filter for one of the primaries red, green and blue that, in combination, produce a full-colour image.
ECONOMIST: Curtains for celluloid
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While the casual camper may be happy with instant coffee, the Flash Java Kit includes a French-press filter for a more refined brew as well as sample packet of Green Mountain Coffee organic house blend.
WSJ: A Coffee Press for Campers