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  2. Standard illuminant - Wikipedia

    en.wikipedia.org/wiki/Standard_illuminant

    The CIE positions D65 as the standard daylight illuminant: [D65] is intended to represent average daylight and has a correlated colour temperature of approximately 6500 K. CIE standard illuminant D65 should be used in all colorimetric calculations requiring representative daylight, unless there are specific reasons for using a different illuminant.

  3. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    T – Tunable microwave device; W – Water cooling; The following group of digits indicate: Microwave tubes: Frequency in GHz; Rectifying tubes: DC output voltage in kV; Thyratrons: Peak inverse voltage in kV; Transmitting tubes: Maximum anode voltage in kV; The following group of digits indicate the power: Backward-wave amplifier or Traveling ...

  4. Light-emitting diode - Wikipedia

    en.wikipedia.org/wiki/Light-emitting_diode

    Such problems inhibit industrial use. Multicolor LEDs without phosphors cannot provide good color rendering because each LED is a narrowband source. LEDs without phosphor, while a poorer solution for general lighting, are the best solution for displays, either backlight of LCD, or direct LED based pixels.

  5. Southern Pacific 4449 - Wikipedia

    en.wikipedia.org/wiki/Southern_Pacific_4449

    No. 4449's replica builder's plate and American Freedom Train plaque. No. 4449 was the last member of the Southern Pacific Railroad's (SP) first order of GS-4 locomotives. No. 4449 was placed into service on May 30, 1941, and spent its early career assigned to the Coast Daylight, Southern Pacific's premier passenger train between San Francisco and Los Angeles, California, but it also pulled ...