OSRAM DULUX F - Manual (Page 75)

Economical long-life light sources with plug-in bases
Compact Fluorescent Lamps OSRAM DULUX ®
Technical Guide
73
A. Information for luminaires manufacturers.
Maximum lamp cap temperature (measuring point 1*).
The highest temperatures on the lamp cap occur close to the electrode-containing legs. Those legs
have only one connection (bridge or bend) to another leg.
For lamps having electrodes in adjacent legs (example A)
The temperature shall be measured at the lamp cap surface, on the outer tangent plane connecting
the electrode-containing legs, at the point halfway between the two legs. In case there are 2
symmetric outer tangent planes, any of them can be used. If the shortest distance between its
position and the surface of the electrode-containing leg is more than 3 mm, the measurement
position shall be taken at a position on the tangent at a distance 3 mm from the surface of the
electrode-containing leg. In the latter case one shall take measurements at both electrode-
containing legs and take the highest temperature reading, to identify the worst case situation in
case of asymmetrical thermal load to the electrodes.
For the CFL SQUARE ® lamp (GR8 and GR10q caps all wattages)
The temperature shall be measured at a point on the cap surface which is equidistant between the
two glass limbs emerging from the cap. It shall also lie on the straight line that joins the axes of the
glass limbs.