Light

Download small medium full
(Light): low energy fluorescent compact light posterised 4 DHD.gif
D=2001/06/15 [Jun 15, 2001]; S=263kB, 3072x2048; T=GIF image [MIME:image/gif].
FREE to download and use! (c) Damon Hart-Davis

Rating: 56/100.

Key: D= file date of exhibit; S= size in bytes, XxY pixels, etc; T= type of exhibit; L= location/time or viewpoint of exhibit (if known).

• low energy = low power, high-efficiency, efficient, "green" = Typically LED or CFL, such "low-energy" lighting is many times more efficient (in terms of light output power for given input electrical power) than "standard" incandescent tungsten-filament bulbs, which of necessity must get very hot and generate a lot of heat.
• low energy fluorescent = An electric current from the lamp's ballast flows through the gas (which includes toxic Mercury/Hg) contained in the tube of a fluorescent lamp, producing UV (ultraviolet) light which then excites a white phosphor coating on the inside of the tube, which in turn emits visible light.
• low energy fluorescent compact = CFL, Compact Fluorescent Lamp

• posterised = (posterized) reduced colors, eg for printing on a poster

About This Category

Variants Of This Exhibit

Thumbnail	Exhibit Name
	low energy fluorescent compact light 4 DHD.jpg (Light) low energy = low power, high-efficiency, efficient, "green" low energy fluorescent compact = CFL, Compact Fluorescent Lamp

Some Similar Exhibits

Thumbnail	Exhibit Name
	low energy LED 5W cool white bulb 240V mains alongside 11W CFL warm white lights on domestic spotlight strip for comparison 1 DHD.jpg (Light) low energy = low power, high-efficiency, efficient, "green" low energy led = LEDs, Light Emitting Diode, Solid-State Lighting, SSL LED lamp sourced from ultraleds.co.uk part number ES5X1CW. This seems to be the yellow-phosphor-over-blue-LED style of construction and gives a very bluish cold and 'ghostly'/icy light from very tight point sources. Not very comfortable, to we're going to try to get used to it. These photos don't give a sense of how cold the light colour is. The light output is however very good for a bulb with less than half the energy input of the adjacent CFL (compact fluorescent lamp) bulbs.
	low energy fluorescent compact light CFL 240V AC 20W triple U tube in desk anglepoise lamp closeup 1 DHD.jpg (Light) low energy = low power, high-efficiency, efficient, "green" low energy fluorescent compact = CFL, Compact Fluorescent Lamp

---

	Web gallery.hd.org

Metadata XML.

XHTML (mobile) --- Catalog Page