• ref: https://blog.1000bulbs.com/home/color-temperature-explained

Quick Notes:

• 5000K, like sun light look (cool)
• 2700k, like flame look (warm)
• Warm Color Temperatures (2700K to 3500K):
  • people more like these color, often seen in home and hotel or restaurant
• Cool Color Temperatures (4000K to 4500K):
  • often as task lighting in offices, kitchen under-cabinet lighting or craft rooms
  • human see higher color temperatures to be “brighter” (lumens) than warm temperature
  • human see higher color temperatures to be “clean” (like those product flash shots, flash is 5600K)
  • human see higher color temperatures to be making “Object Color Clear” and “Things to spot clean”, like toilet, kitech cleaning check
• Full Spectrum Color Temperatures - Daylight = full sepctrum (5000K to 6500K): often seen in museums, jewelry stores, showcase windows, and hospitals

Object Color Distort by Color Temperature

• color temperature + light brightness + rendering (Color Rendering Index - CRI) can cause human see/precept color “Differently”
• ref: https://blog.1000bulbs.com/home/what-is-metamerism
• Fight Between “Camera White Balance setting” and “Light Color Temperature”

• E27: means standard Edison screw bulb, 27mm diameter (Thumb size), [also used in cheap softbox lights]
• E14 (SES): small Edison screw mount, 14mm diameter (pinky size)
• E17 (IES): intermediate, like for microwave
• E12 (CES): Candelabra, like for decoration
• E10 (MES): miniature, like torch buibs

• Illuminance (照度):
  • Luminous energy per unit time
  • If you ILLUMINATE an object and measured the amount of light being projected towards it by the light, that is ILLUMINANCE
  • lux (= lumen per square metre)
• Luminous flux, luminous power (光通量):
  • Luminous flux incident on a surface
  • LUMINANCE is the amount of light reflected off the surface being ILLUMINATED!
  • lumens = Luminous flux
• ref:
  • https://en.wikipedia.org/wiki/Lumen_(unit)

• Godox SL60W review
  • https://www.adorama.com/r/gosl60w-reviews
  • https://digital-photography-school.com/godox-sl60w-review/
• Aputure 120D review:
  • https://digitalfilmmaker.net/led-fresnel-aputure-light-storm-cob-120d/
  • http://www.wetestlights.com/test.php?l=307&n=Light%20Storm%20120d%20II