Marker Lamps on the Market
Page 61
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-40NFLISION about some aspects of
the regulations for front corner and ide marker lamps seems widespread mong all sections of the industry chiefly oncerned with them—operators, trailer takers and lamp manufacturers. Even le last-named are not all perfectly sure f the minimum requirements for the ctual lamps, and those that are offering nits are, in general, covering all likely nerpretations of the complex wording f the regulations.
It is quite clear that for both front arner and side marker lamps the bulb ,attage must not exceed 7 w., and lenses r glasses must be frosted or at least give mile form of diffusion. The regulations lso state that a front corner lamp, and se white and red parts of a side marker imp, must each have an illuminated area f at least 1 in, diameter, or, if not ircular, an area not less than that of a -in.-diameter circle. But the term illuminated area" is defined in the :gulations as: "the area of the orthognal projection on a vertical plane at ight angles to the longitudinal axis of
the vehicle of that part of the lamp through which the light is emitted ".
The Commercial Motor interpretation of this is that the definition means a forward-facing illuminated area for a front corner marker lamp, and both forward-facing (white) and rearwardfacing (red) illuminated areas for side marker lamps. It does not stipulate, as some people seem to think, a minimum area for the illumination seen from the side of the vehicle.