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Illumination mcd for flashlight bulbs ?

E

ef

Jan 1, 1970
0
Anyone know, or point me towards the light output, preferably in mcd's,
for normal flashlight bulbs, P9 base, or screw, 2.4v, 4.8v, 6v etc

Thanks
 
W

Watson A.Name - \Watt Sun, the Dark Remover\

Jan 1, 1970
0
ef said:
Anyone know, or point me towards the light output, preferably in mcd's,
for normal flashlight bulbs, P9 base, or screw, 2.4v, 4.8v, 6v etc

Thanks

I believe that the mCd is dependent on the reflector, and how narrow the
beam is, so it can't be determined with just the lamp itself. The lamp
catalogs give the ratings in candlepower.

Go to Don's lighting pages for more info,
http://members.misty.com/don/light.html
 
D

Don Klipstein

Jan 1, 1970
0
Watson A.Name - \"Watt said:
I believe that the mCd is dependent on the reflector, and how narrow the
beam is, so it can't be determined with just the lamp itself. The lamp
catalogs give the ratings in candlepower.

Go to Don's lighting pages for more info,
http://members.misty.com/don/light.html

I don't give any specific photometric numbers of any incandescent
flashlight lamps there.

Most "miniature lamps" have output stated in "spherical candlepower" or
"MSCP", one of which is 4-pi lumens. Assuming a straight or only slightly
curved filament, candela in the plane perpendicular to the filament axis
is higher by a ratio close to 4/pi.

As for candela of a flashlight: Yes it is true, this is heavily a
function of a flashlight's optics. However, this is limited to frontal
area of the reflector (or lens) times the surface brightness of the
filament in candela per square centimeter, which I consider very unlikely
to exceed 3,300 (half the figure for a 3300 Kelvin blackbody) - much less
for lamps with a vacuum (require lower filament temperature), such as
PR-2, 14, and most others under about a watt or both under 3 watts and
drawing less than about .35 amp unless noted as having a premium gas fill
or being halogen.

I have major doubts about the "candlepower" claims of most of those
supposedly million and multimillion candlepower handheld spotlights.

- Don Klipstein ([email protected])
 
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