b'Cons: Incandescent lighting is hideously expensive as a lot of power is required to \x05\x0b\x03\x08\x06\x01\x0b\x08\x05\x01\x12\x1f\x1c\x14\x19\x12\x1a\x1f produce the energyone light bulb only lasts roughly 1000 hours. The heat it generates makes them too hot to touch, and so they are dangerous in certain situations.Incandescent light bulbs are gradually being replaced in many applications by sources that produce more light but use less electricity, such as uorescent lightingFluorescentlightinguseselectricitygeneratedthroughgasdischargeina nutshell, a tiny amount of mercury in a phosphor-lined glass tube emits ultraviolet (UV) light. The phosphor absorbs the UV light and re-emits it as light the human eye can see. \x0e\x06\x04\x0b\x01\x12\x1f\x1c\x14\x19\x12\x1a\x1f Pros: Compact uorescent lamps are super energy efcientthey produce a quarter of the heat per lumen of an incandescent light bulb and last about six times longer (about 6000 hours). Cons: To the conventional eye, uorescents sometimes seem too bright and appear to make colours look unnatural and garish. To combat this, opt for the yellow-tubed uorescents (such as warm white) instead of pure white ones, or an extremely low-\x11\x02\x08\x06\x01\x14\x1e\x17\x17\x16\x16\x01 \x12\x13\x1b\x16 wattage lamp. Also, uorescent light cannot be used in dimmers. Light-emitting diodes (LED). This will be the most practical light source in the years to come, according to Robert Victoriana. Generated by a semi-conductor, its the light you see in ashlights and cell phones. Pros: LEDs are ve times as power-efcient as uorescent lighting but there is a catchat present, the microchip inside the LED light only emits light in one direction. It doesnt reect it back, which means it doesnt allow us to see colour. The solution, says Robert, is to design lenses that go on top of the LED and disperse the light. \x06\x0f\x01\x0c\x07\x10\x01\x15\x1a\x1d\x1a\x1d\x18\x01\x14\x19\x12\x1a\x1f when light tricks our sightMost of us will have experienced the navy sock/black sock scenario. You take a pair of apparently black socks out of the drawer, then realise later that one of them is actually blue. Dont worry, it doesnt mean youre colour blindits a common phenomenon called sample metamerism. The reason for the optical illusion is that the wavelength emission between various light sources, such as incandescent and uorescent light, differs. Incandescent light bulbs \x0c\x1e\x15\x1d\x0e\x17\x11\x01\x12\x1a\x1b\x01\x0e\x1a\x1d\x14\x01\x1b\x11\x1c\x15\x10\x11\x19\x1d\x15\x17\x01 emit very few short blue wavelengths, which makes it hard to tell whether a colour we \x19\x10\x01\x0f\x1a\x18\x18\x11\x1b\x0f\x15\x17\x01\x1e\x1c\x11\x03\x01 see in such light is dark blue or black. Fluorescent light, on the other hand, emits more \x0c\x11\x11\x01\x1a\x1e\x1b\x01\x1f\x11\x0e\x1c\x15\x1d\x11\x01\x12\x1a\x1b\x01\x01\x12\x1e\x17\x17\x01 short-wavelength light, and so its easier to distinguish the two colours. \x1b\x19\x13\x11\x01\x19\x10\x01\x1c\x1d\x1a\x0f\x16\x15\x1c\x1d\x1c\x03On the ipside, you can also have two identical colour samples that look vastly \x03\x06\x07\x06\x04\x0c\x01\x03\x08\x06\x04\x06\x0b\x01\x02\x08\x08\x0c\x06\x05 different when viewed under different lights. This phenomenon, called illuminant \x0b\x14\x1a\x19\x11\x01\x02\x08\x07\x01\x01\x06\x04\x06\x01\x06\x05\x05\x0c\x0c\x0c\x01\x08\x03\x04\x03\x02\x0b\x08\x05\x03\x02\x03\x01\x02\x07\x01\x06'