les armatures TL sont prévues en dimensions leur permettant de s'intégrer dans in plafond métrique ;

"We manufacture METRIC Drop Ceiling Tiles. ($8.00 - Unfinished)
Unfortunately, we as Americans are the last ones on the planet to embrace the metric system. Anyone in the metric world who wants to use USA drop tiles has 2 options:
Import imperial sized grid
Buy something else
Since we don't really like either option, we have built tooling to manufacture metric dimension panels. Now you can order your metric panels from American Tin Ceiling Co. and purchase your 24mm grid locally. We look forward to hearing from you concerning your next remodel or acoustical tile replacement. Metric Drop-Ins are made to fit:
600mm X 600mm on center grid"
http://www.americantinceilings.com/drop-metric.html

" Recessed Fluorescent | RMI SAKA
RMI SAKA - T8 Series

RMI SAKA T8 Series
Features :
Suitable for all metric ceiling
The concave shape can provide excellent light on high efficiency
The aesthetic outlook can provide high output or asymmetric light distribution to fit almost all application"
http://www.saka-lighting.com/front/index.php/rmi-saka