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  2. Luminous efficacy - Wikipedia

    en.wikipedia.org/wiki/Luminous_efficacy

    lux (= lumen per square metre) lx (= lm/m 2) L −2 ⋅J: Luminous flux incident on a surface Luminous exitance, luminous emittance M v: lumen per square metre lm/m 2: L −2 ⋅J: Luminous flux emitted from a surface Luminous exposure: H v: lux second: lx⋅s L −2 ⋅T⋅J: Time-integrated illuminance Luminous energy density ω v: lumen ...

  3. Battery charger - Wikipedia

    en.wikipedia.org/wiki/Battery_charger

    A battery charger, recharger, or simply charger, [1] [2] is a device that stores energy in an electric battery by running current through it. The charging protocol—how much voltage and current, for how long and what to do when charging is complete—depends on the size and type of the battery being charged.

  4. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    A common battery type in cameras and photographic equipment. In Switzerland as of 2008, these batteries accounted for 6% of lithium camera battery sales. [75] 2CR5: EL2CR5 DL245 RL2CR5 KL2CR5 6135-99-577-2940 (NSN) 2CR5: 5032LC [137] 1,500: 6: Double cylinder. Keyed. Both on one end. Terminal center spacing 16 mm. H: 45 mm L: 34 mm W: 17 mm

  5. Orders of magnitude (illuminance) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    Factor ()Multiple Value Item 0 0 lux 0 lux Absolute darkness 10 −4: 100 microlux 100 microlux: Starlight overcast moonless night sky [1]: 140 microlux: Venus at brightest [1]: 200 microlux

  6. Lumen (unit) - Wikipedia

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

    The lumen (symbol: lm) is the unit of luminous flux, a measure of the perceived power of visible light emitted by a source, in the International System of Units (SI). Luminous flux differs from power ( radiant flux ), which encompasses all electromagnetic waves emitted, including non-visible ones such as thermal radiation ( infrared ).

  7. Automobile auxiliary power outlet - Wikipedia

    en.wikipedia.org/wiki/Automobile_auxiliary_power...

    The actual voltage, matching the car battery's voltage, will be approximately 12.5 volts when dormant (less in cold conditions), approximately 14.5 volts when the engine and the alternator/generator are operating (more when cold), and may briefly drop as low as 5–6 volts during engine start due to the high temporary battery current usage. [12]

  8. GB/T charging standard - Wikipedia

    en.wikipedia.org/wiki/GB/T_charging_standard

    Cars with battery voltages higher than the charger's voltage rating will not be able to charge at all (e.g. chargers with the minimum GB/T voltage of 750V will not be able to charge a 800V battery), though some such as the Hyundai E-GMP and Porsche Taycan can still use lower voltage chargers through the use of a boost converter. [9]

  9. High-intensity discharge lamp - Wikipedia

    en.wikipedia.org/wiki/High-intensity_discharge_lamp

    Xenon, or high-intensity discharge (HID), lighting provides brighter headlights and increases visibility of many peripheral objects (e.g. street signs and pedestrians) left in the shadows by standard halogen lighting. However, the bright headlights have given rise to complaints about glare. [10]

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