.
-as of [10 SEPTEMBER 2025]-
.
*SYMBOL* —>
-CD-
.
.
-[ELECTRO-MAGNETIC] RADIATION-
-VISION-
.
*FREQUENCY* —>
-[540 × 1012] Hz-
.
-DEFINE THE “LUMINOUS EFFICACY” OF RADIATION WITH THIS FREQUENCY AS “683”-
-THE UNIT IS [[LUMENS] / [WATT]]-
(LM / W)
.
-[CANDELA] x [2π]-
.
[2π]
(6.28)
.
*full circle* —>
(360°)
.
*half circle* —>
(180°)
.
(joules / second)
-[KILO-GRAMS] X [METERS]2–
/
-[SECONDS]3–
.
*the ‘candela’ […] is defined by taking the…*
…’fixed numerical value’…
…of the ‘luminous efficacy’…
of ‘mono-chromatic radiation’…
…of frequency 540 × 1012 Hz, Kcd …
to be 683 when expressed in the unit lm W–1
which is equal to cd sr W–1
or cd sr kg–1 m–2 s3
where the ‘kilogram’ / ‘metre and second are defined in terms of
.
-THE ORIGINAL “REFERENCE” FOR “LUMENS / WATT” WAS A “BLACK BODY RADIATOR” MADE OF [PLATINUM]-
.
[683] = [LUMENS] / [WATTS]
[LUMENS] = [683] X [WATTS]
.
[CANDELA] X [2π]
=
[683] X [KILO-GRAMS] X [METERS]2
/
[SECONDS]3
.
“CANDELA”
=
[683] X [KILO-GRAMS] X [METERS]2
/
[SECONDS]3 X [2π]
.
(the ‘candela’ is the ‘SI base unit’ of ‘luminous intensity’…)
(….that is, ‘power’ emitted by a ‘light source’ in a particular direction)
.
(weighted by the ‘luminosity function’…)
(…a standardized model of the ‘sensitivity’ of the ‘human eye’ to different ‘wavelengths’)
*aka the luminous efficiency function*
.
*a ‘common candle’ emits ‘light’ with a ‘luminous intensity’ of ~ 1 candela*
.
(if ’emission’ in some ‘directions’ is blocked by an ‘opaque barrier’, the emission would still be approximately one candela in the directions that are not obscured)
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*the word candela means candle in [‘latin’ / ‘spanish’ / ‘italian’]*
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*👨🔬🕵️♀️🙇♀️*SKETCHES*🙇♂️👩🔬🕵️♂️*
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💕💝💖💓🖤💙🖤💙🖤💙🖤❤️💚💛🧡❣️💞💔💘❣️🧡💛💚❤️🖤💜🖤💙🖤💙🖤💗💖💝💘
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*🌈✨ *TABLE OF CONTENTS* ✨🌷*
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🔥🔥🔥🔥🔥🔥*we won the war* 🔥🔥🔥🔥🔥🔥