Young Brunette Girl In The Old House Reveals Her Black Top In The Room With Candles

• Light
Based on measurements of a taper-type, paraffin wax candle, a modern candle typically burns at a steady rate of about 0.1 g/min, releasing heat at roughly 80 W. The light produced is about 13 lumens, for a luminous efficacy of about 0.16 lumens per watt (luminous efficacy of a source) - almost a hundred times lower than an incandescent light bulb.
The luminous intensity of a typical candle is thus approximately one candela. The SI unit, the candela, was in fact based on an older unit called the candlepower, which represented the luminous intensity emitted by a candle made to particular specifications (a "standard candle"). The modern unit is defined in a more precise and repeatable way, but was chosen such that a candle's luminous intensity is still about one candela.