This is the term used by one of my FR customers, who is a major lighting manufacturer; in EN, both 'burn-in' and 'running-in' periods are found in connection with fluorescent lamps; the processes are entirely analagous.

Do note that 'burn-in' is also used in other electronics contexts to refer to something slightly different: the period of time during which a piece of equipment may be run in order to reveal any latent faults, which are likely to develop during the initial stages of use. I believe this use should already be in the glossary.

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Note added at 6 heures (2016-04-26 06:22:24 GMT)
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This page:

https://www.etcconnect.com/Support/Articles/Fluorescent-Dimm...

explains briefly what this burn-in period is in relation specifically to fluorescent lamps.

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Note added at 6 heures (2016-04-26 06:46:00 GMT)
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Despite the fact that F-X disaaproves, for very good reason of the use of 'rodage' for its mechanical connotations, this IS the term used by several different FR manufacturers involved in the lighting industry.

Here's one example from giant Osram (though for that reason, possibly a translation from EN!)

Les solutions pour une gestion de l'éclairage ... - Osram

http://www.osram.fr/media/resource/HIRES/342547/2013--gestio...

Un rodage de 100h à 100 % du flux est obligatoire avant de faire varier l'intensité lumineuse. ....