ILUMINARC Ilumipanel™ 28 IP User Manual

Page 19

Ilumipanel 28 IP Optic RGB User Manual (Rev. 6)

LED Life: ILUMINARC

rates LED lifetime based on lumen depreciation of 70% of the original output, with data provided

by the manufacturer of the LED. Data from the manufacturer of the LED are not independently verified or measured by
ILUMINARC

. When the fixture is operating in optimal environmental conditions, the LED lifetime is rated to be 50,000 to

70,000 hours by the LED manufacturer.

LED Binning: LED manufacturers sort LEDs into “bins”, based on variances in color, output intensity and the frequency at
which the semiconductor operates. ILUMINARC

strives to hold its LED manufacturers to the highest standards of

binning to optimize consistency in output from fixture to fixture. However, the availability of a single bin cannot be
guaranteed. With that in mind, ILUMINARC

has developed a rigorous control system to seek the best achievable

consistency in color and output.

Color Rendering Index (CRI): CRI is an industry standard method to compare properties of different types of light sources.
There are known limitations and inconsistencies related to CRI. Results may vary depending on the environmental factors
involved. For this reason, the US Department of Energy (DOE) states that CRI should be considered as one point of
reference among others in evaluating white LED products and systems.

The following is an excerpt of recommendations from the DOE:

1. Identify the visual tasks to be performed under the light source. If color fidelity under different light sources is critically
important (for example in a space where color or fabric comparisons are made under both daylight and electric lighting),
CRI values may be a useful metric for rating LED products.

2. CRI may be compared only for light sources of equal CCT. This applies to all light sources, not only to LEDs. Also,
differences in CRI values of less than five points are not significant, e.g., light sources with 80 and 84 CRI are essentially
the same.

3. If color appearance is more important than color fidelity, do not exclude white light LEDs solely on the basis of relatively
low CRI values. Some LED products with CRIs as low as 25 still produce visually pleasing white light.
4. Evaluate LED systems in person and, if possible, on-site when color fidelity or color appearance are important issues.

Source: DOE publication: PNNL-SA-56891, January 2008