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THE TEST AND LIGHTS

22nd January 2009
Page 41
Page 41, 22nd January 2009 — THE TEST AND LIGHTS
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We used a Daf XF as the test vehicle to assess the three lights provided by the Dun-Bri Group. Once night descended, we took the truck to the Parallel Straights at the MIRA Proving Ground and pointed it down the mile-long straight, measuring the lights in lux using a light meter.

Lux is a unit of illumination of one square metre which is one metre away from a uniform light source. To put the results in context, direct sunlight has a light level of 100,000 to 130,0001ux, whereas an overcast day would only after 1,000Iux.

At night the lux level drops below 1.0: a full moon offers 0.1lux, and a moonless, overcast night sky offers just 0.0001lux.

A storage or plant facility where people move requires 15010 250Iux, loading bays need 500 to 750Iux, and inspection, welding and machinery environments require 750 to 1.000Iux Each of the three lights had an H7 bayonet fitting and ratings of 70W and 24V. We took a lux reading at source and then found the distance at which the lightmeter gave a reading of zero To ensure there was no favouritism, Dun-Bri placed the bulbs in three boxes labelled A, B and G, only once the test was complete were the identities of the three lights revealed.

• Bulb A was an aftermarket product by AutoLamp, price £2.50.

• Bulb B was an OE-quality build by Osram, which claims to be four times as long-lasting, price £12.

• Bulb C was the Osram Truckstar, claimed to have double the service life of basic aftermarket, price £16

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