149 PM Brightness and colour temperature Brightness (luminous flux) The light flux (also known as brightness) emitted by a bulb is expressed in lumen (lm). Traditional incandescent or halogen light bulbs only indicated electric power in watt (W); watts actually indicate energy consumption and not the real quantity of light emitted. Watt consumption being equal, modern light bulbs (using the LED technology or other low consumption technologies) have a much higher brightness. As an indication, the table here below shows the correspondence between halogen bulbs and any modern bulb whose brightness is expressed in lumen. A light source having luminous flux equal to 10 lumen 20 lumen 50 lumen 70 lumen 100 lumen 150 lumen 200 lumen 250 lumen 350 lumen 500 lumen Replaces a halogen bulb of 0.5 watt 1 watt 3 watt 4 watt 6 watt 9 watt 12 watt 15 watt 20 watt 30 watt Colour temperature Colour temperature is a characteristic of visible light and is expressed in kelvin (K). Any light source has a distinctive colour temperature ranging from warm (such as a candle, 1000 K) to cool (Xenon lamps, 6200 K). Warm lights have a yellow/orange shade and make ambients more comfortable to the detriment of the colour fidelity of the surrounding objects. Cool lights - over 5300 K - result in bluish tones. Traditional incandescent bulbs have a warm light (about 2900 K) but cooler lights are used to light up work areas (3500 K to 6000 K): IP protection degree Ex. IP67: 6 = complete protection against ingress of dust. 7 = Ingress of water is possible when the enclosure is immersed in water under defined conditions of pressure and time. IP X Y Code breakdown (International Protection) X = solid particle protection (0-6) Y = liquid ingress protection (0-8) 0 No protection 0 No protection 1 Protected against ingress of solid particles > 50-mm Ø 1 Protection against vertically falling drops 2 Protected against ingress of solid particles > 12-mm Ø 2 Protection against dripping water when tilted at any angle up to 15° from the vertical 3 Protected against ingress of solid particles > 2.5-mm Ø 3 Protection against water falling as a spray at any angle up to 60° from the vertical 4 Protected against ingress of solid particles > 1-mm Ø 4 Protection against water splashing against the enclosure from any direction 5 Protection against ingress of dust (dust protected) 5 Protection against water jets 6 Complete protection against ingress of dust (dust tight) 6 Protection against powerful water jets 7 Protection against temporary immersion in water 8 Protection against continuous immersion in water
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