At 07:03 PM 3/23/2009, David Beierl wrote... >>2) 80 cp sounds way to high as a minimum for a stop bulb. The 1156 is >>a common US stop light bulb, and puts out 32 CP. > >I thought so too, but look at the values they allow for front turn >signals that are near headlights! Could it be a mistake in >units? Note that U,D,L,R,H in the figures mean Up, Down, Left, Right, >Horizontal. As I understand it, Figure 1a refers to fixtures, whereas >1b refers to the actual lamps. I think that when they say "candlepower," they really mean effective mean spherical candlepower, which is really flux (lumens), but in Imperial units. A bulb which puts out 32 CP could certainly provide 80 effective MSCP on-axis in a lamp, since there's a reflector (a perfect reflector with a cutoff of 180 degrees would double the effective MSCP in the illuminated hemisphere), plus lens. In any case, even with #93 bulbs in Vanagon running lamps, brake lights are easily noticed due to the design (I upgraded brake lamps to #1295 bulbs, which have 45 CP). |
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