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2. List of automotive light bulb types - Wikipedia

   en.wikipedia.org/wiki/List_of_automotive_light...

   12 V: 60 / 55 W P26.4t USA ANSI № 9008 ECE nominal luminous flux: 1,700 / 1,100 lm ±15% H13A 2 12 V: 60 / 55 W PJ26.4t USA H15 2 12 V: 55 / 15 W 24 V: 60 / 20 W PGJ23t-1 USA ECE nominal luminous flux: 26/1350 ±10% Low-wattage filament for DRL function H16 1 12 V: 19 W PGJ19-3 H16B 1 12 V: 19 W PGJY19-3 H21W 1 12 V & 24 V: 21 W BAY9s H27W/1 1

3. A-series light bulb - Wikipedia

   en.wikipedia.org/wiki/A-series_light_bulb

   The most commonly used A-series light bulb type is an A60 bulb [7] (or its inch-based equivalent, the A19 bulb [2] [4]), which is 60 mm (19 ⁄ 8 in or 2 + 3 ⁄ 8 in) wide at its widest point [3] and approximately 110 mm (4 + 3 ⁄ 8 in) in length. [8] Other sizes with a data sheet in IEC 60064 are A50, A55, A67, A68, A71, A75, and A80.

4. Lumen (unit) - Wikipedia

   en.wikipedia.org/wiki/Lumen_(unit)

   For example, according to the European Union standard, an energy-efficient bulb that claims to be the equivalent of a 60 W tungsten bulb must have a minimum light output of 700-810 lm. [ 14 ] To estimate lumens from watts for various types of lamp, see luminous efficacy .

5. Luminous efficacy - Wikipedia

   en.wikipedia.org/wiki/Luminous_efficacy

   lumen per watt: lm/W: M −1 ⋅L −2 ⋅T 3 ⋅J: Ratio of luminous flux to radiant flux: Luminous efficacy (of a source) η [nb 3] lumen per watt: lm/W: M −1 ⋅L −2 ⋅T 3 ⋅J: Ratio of luminous flux to power consumption Luminous efficiency, luminous coefficient V: 1: Luminous efficacy normalized by the maximum possible efficacy See also:

6. High-CRI LED lighting - Wikipedia

   en.wikipedia.org/wiki/High-CRI_LED_lighting

   For example, the top bulbs listed in the 2016 Consumer Review have a CRI of 80. [3] In 2008, the U.S. Department of Energy created the L Prize to find an incandescent light bulb replacement that met efficiency metrics and had a CRI above 90. [4] On August 3, 2011, Philips was declared as the first winner of the L Prize. [5]

7. Optical depth - Wikipedia

   en.wikipedia.org/wiki/Optical_depth

   The spectral optical depth in frequency (denoted ) or in wavelength of a material is given by: [1] = (,,) = ⁡ = (,,) = ⁡, where , is the spectral radiant flux in frequency transmitted by that material;