Show pageOld revisionsBacklinksBack to top This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ====== Light Bulb ====== ^ Name ^ light meter (ISO 100, T 125) ^^^ | ikea 9W 5000K bulb | inner: F5, EV12 | softbox: F1.8, EV9 | 1m: F0.8, EV6.5 | | set photo 135W 5500K bulb | inner: F6.3, EV12.8 | softbox: F3.2, EV10.7 | 1m: F1.1, EV7.3 | ====== Color Temperature and Lumens ====== * 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" ====== LED Lights ====== * 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)|https://en.wikipedia.org/wiki/Lumen_(unit)]] ^ Light ^ Temperature | accuracy ^ watte | lumens | vari ^ Modifier ^ Price | Exposure | | Godox SL60W | 5600k+200K | CRI93 | 60W | 4500 | 10-100% | Bowens mount | 125sgd | remote | (60cm, direct) EV10.5 (1/60,iso100,f5) \\ (60cm,umbrella) EV9 (1/60,iso100,f2.8) | | Aputure 120D ii | 5500k | CRI96 | 180W | 14300 | | | 1000sgd | remote | | Godox SL200W | 5600k+200K | | 200W | 20000 | | | 500sgd | | TRADFRI LED E27 980lm | 2.2-2.7,4k | | | 980 | ~ | | 40sgd | remote | | TRADFRI LED E27 1000lm | 2.7k? | | | 1000 | ~ | | 30sgd | remote | | | RYET LED E27 1000lm | 5k | | 9W | 1000 | | | 3sgd | | (60cm, diffuse, 3x) EV9 (1/60,iso100,f2.8) | | LEDARE LED E27 1000lm | 2.7k-warmer | CRI90 | 11W | 1000 | ~ | | 5sgd | | LEDARE LED E27 1000lm | 2.7k-warmer | | | 1000 | ~ | | 8sgd | | LEDARE LED E27 1600lm | 2.7k-warmer | | 16W | 1600 | ~ | | 10sgd | * 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 photowiki/light.txt Last modified: 2023/01/07 15:07by ying