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.
380