LED checklist

This is a checklist of relevant features of Luxo LED luminaires.  The information it contains is of a general nature.  For questions regarding specific products, please consult Luxo Customer Service.
Subject Explanation

Lifetime LED luminaires (L70) The lumen degradation of Luxo LED luminaires is L70: at least 50,000 hours at 77º(25ºC) unless specified otherwise.  The luminaire is marked with the maximum Ta that gives at least L70 at 50,000 hours.  We also list L70 at Ta 77ºF (25ºC).  Read more about LED lumen degradation in the LED section on our website.

Lifetime LED driver/converter LED driver lifetime of Luxo luminaires is at least 50,000 hours at maximum rated Ta.  As a minimum, the Ta is 77ºF (25ºC).  Normally a failure rate of maximum 10% applies.

LED lifetime documentation LED module and driver lifetimes are documented by measuring the components' Tc point temperature, (the Tc point is a specific point on the component) and compare it to the components' maximum rated temperature.  Temperature measurements are performed at our laboratories and carried out at an ambient temperature of 77ºF (25ºC).  Heat measurement reports and lifetime calculations are available on demand.

What is the Ta for Luxo fixtures? Luxo luminaires are tested and approved for an ambient temperature (Ta) of 77ºF (25ºC), unless otherwise noted.  A selection of our luminaires are approved for Ta of 131ºF (55ºC).

What if one diode in the LED-module stops working? A standard safety design on most Luxo LED modules is that any single LED failure on LED modules containing more than one LED will result in a short circuit rather than an open circuit.  The short circuit will ensure that the current is conducted through the module and that the other LEDs continue to work.

What is the lumen output
of the LED luminaire?
Luxo provides actual lumen output or "lumen out" of all our LED luminaires on the spec sheet and website.  We advise our customers to carefully note the difference between the light output of the LED module itself and that of the complete luminaire.

What is the variation in flux across modules/fixtures
(within the same LED generation)?

The variance in lumen output on Luxo luminaires is +/- 10%.  This means that the light flux from a luminaire is stable, but may vary across many luminaires.
What is the color
temperature?
The color temperature of Luxo luminaires is listed on the spec sheet or website.

What is the color
tolerance?
The color tolerance of Luxo luminaires is expressed by a number of MacAdam steps.  The more steps, the higher tolerance.  An explanation may be found in the LED section of our website.  Most of our luminaires have an initial tolerance of 3 MacAdam steps.  This equals +/- 100ºK at 3000ºK, but this tolerance increases with higher color temperatures.  Other tolerances up to 5 MacAdam steps may occur and are properly marked in product documentation.

What is the color stability
over the lifetime?
A small shift in color over time may be experienced because of changes inside the LED itself. This shift is in most cases not visible, but may in some cases lead to a higher MacAdam tolerance, e.g. from 3 to 4 steps.

What is the CRI? The CRI of most Luxo luminaires is 90.  For certain products the CRI may vary so please refer to product spec sheets or the product section of our website for specific values.  

Does the Ra change over
the lifetime of the fixture?
The CRI for Luxo luminaires is normally listed as a minimum value, i.e. that the CRI value will never drop below the stated CRI over the lifetime of the luminaire.

What is the chemical compatibility (corrosion resistance) of
the LED module?
Certain types of LED packages are inclined to degradation from chemical substances such as fluorides, sulphur oxide and others.  In case such gases are present, special care needs to be taken when selecting LED types.  Please consult our Customer Service for more information relevant to your project.

What is the technology
used for dimming?
There are basically two ways to dim LEDs. 1: linear current reduction where the output current magnitude, and hence the light level, is reduced (also called amplitude modulation), or 2: PWM (Pulse Width Modulation) where the output current is reduced by chopping the output current.  PWM dimming or a mix of amplitude and PWM is preferred by the major LED driver manufacturers. Most Luxo luminaires have a driver output frequency of minimum 400 Hz, to avoid flicker.

Are light technical data
available?

Yes, via our website.
Is the LED module
replaceable?
LED module replacement is only recommended for positive cost-benefit analyses, since there may be other issues with different light outputs and loss of driver compatibility with the new module.  All of our luminaires have completely integrated LED modules.


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