161 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 with a luminous flux of 10 lumens 20 lumens 50 lumens 70 lumens 100 lumens 150 lumens 200 lumens 250 lumens 350 lumens 500 lumens Replaces a halogen lamp from 0.5 watts 1 watt 3 watts 4 watts 6 watts 9 watts 12 watts 15 watts 20 watts 30 watts Colour temperature The colour temperature indicates the hue of the light, and is measured in kelvin (K). Each light source has its own characteristic colour temperature, ranging from warm (like a candle, 1000 K) to cold (Xenon bulb, 6200 K). The warm lights that tend towards yellow/orange and make environments more welcoming, at the expense of the color fidelity of the illuminated objects; while the cold lights, beyond 5300 K, tend towards blue/blue. 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 E.g. IP67: 6 = completely protected against dust; 7 = protected against the effects of temporary immersion. IP X Y Characteristic Letters (International Protection) X indicates the level of protection against the penetration of solid foreign objects (from 0 to 6) Y indicates the level of protection against liquid penetration (from 0 to 8) 0 No protection 0 No protection 1 Protected against solid objects larger than 50 mm in diameter 1 Protected against vertical drops of water 2 Protected against solid objects over 12 mm in diameter 2 Protected against dripping water or rain up to 15° vertical 3 Protected against solid bodies larger than 2.5 mm in diameter 3 Protected against falling drops of water or rain up to 60° vertical 4 Protected against solid objects over 1 mm in diameter 4 Protected against splashing water from all directions 5 Protected against dust (no harmful deposit) 5 Protected against water jets 6 Totally protected against dust 6 Protected against powerful water jets 7 Protected against the effects of temporary immersions 8 Protected against the effects of continuous immersion
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