Page 382 - Catalogue-UK-ED25
P. 382

LED LIFETIME / LIGHT OUTPUT




       LEDs do not use heat to generate light in the same way as commonly used lights,   incandescent lamps over the life of the product. Use the cost savings calculator
       where 80% of the power used is dissipated as heat. This is why LEDs are referred   on our website to see our estimate of how much our lights can save you
       to as cool to touch and are safer to use, especially in ground light products.   compared to non-LEDs. Lifetime is stated as the number of hours of operation
       However an LED does have an operating temperature within its structure.  This   until the light level emitted from the LEDs will have dropped to a specified
       heat, if not removed will reduce the light output and product lifetime.  This is why   percentage of the original published values.
       LED products have heatsinks or use the body of the product to dissipate the heat
       as quickly and efficiently as possible.             For the majority of Collingwood Lighting products, lifetime is stated as
                                                           ‘L70, B10 X hours’.  Where, ‘L70’ means 70% of original light output remains.
       Many Collingwood LED products have visible heatsinks: these are typically made   ‘B10’ means that 10% of products will have reached this level (i.e. 90% of
       from anodised aluminium and feature many thin fins.  It is essential to have an   products will have a light output greater than 70% of published) after ‘X’ number
       air gap around the heatsink, as this ensures that heat is quickly removed, which   of hours of operation.
       keeps the LED at optimum temperature.
                                                           As an example, the majority of Collingwood Lighting products state lifetime as
       LEDs do naturally lose their ability to produce light over many thousands of hours   L70, B10 for 70,000 hours. However, as LEDs do naturally lose their ability to emit
       so Collingwood Lighting publishes the expected lifetime of products within the   light, even when they have reached this point, they will continue to operate for
       catalogue.  This helps customers to easily determine how long the product will   many hundreds of hours after this level has been reached, but at an
       last, and to calculate how much energy will be saved compared to conventional   ever-reducing level.








       IK RATING



       Degrees of protection against external mechanical impacts.



         NO.       PROTECTION                                NO.        PROTECTION



       IK00        Not protected                           IK06         Protected against 1 joules impact.





       IK01        Protected against 0.14 joules impact.   IK07         Protected against 2 joules impact.





       IK02        Protected against 0.2 joules impact.    IK08         Protected against 5 joules impact.





       IK03        Protected against 0.35 joules impact.   IK09         Protected against 10 joules impact.






       IK04        Protected against 0.5 joules impact.    IK10         Protected against 20 joules impact.





       IK05        Protected against 0.7 joules impact.












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