Color rendering index: Difference between revisions

Revision as of 22:46, 11 April 2023

Revision as of 21:51, 13 April 2023

Line 340:

|-

| [[Sodium-vapor lamp#Low-pressure sodium|Low-pressure sodium]] (LPS/SOX)

| 1800

| style="background-color:#{{Color temperature|1800|hexval}}"|1800

| −44

|-

| Clear [[Mercury-vapor lamp|mercury-vapor]]

| 6410

| style="background-color:#{{Color temperature|6410|hexval}}"|6410

| 17

|-

| [[Sodium-vapor lamp#High-pressure sodium|High-pressure sodium]] (HPS/SON)

| 2100

| style="background-color:#{{Color temperature|2100|hexval}}"|2100

| 24

|-

| Coated mercury-vapor

| 3600

| style="background-color:#{{Color temperature|3600|hexval}}"|3600

| 49

|-

| Halophosphate warm-white [[Fluorescent lamp|fluorescent]]

| 2940

| style="background-color:#{{Color temperature|2940|hexval}}"|2940

| 51

|-

| Halophosphate cool-white fluorescent

| 4230

| style="background-color:#{{Color temperature|4230|hexval}}"|4230

| 64

|-

| Tri-phosphor warm-white fluorescent

| 2940

| style="background-color:#{{Color temperature|2940|hexval}}"|2940

| 73

|-

| Halophosphate cool-daylight fluorescent

| 6430

| style="background-color:#{{Color temperature|6430|hexval}}"|6430

| 76

|-

| [[w:Sodium-vapor lamp|"White" SON]]

| 2700

| style="background-color:#{{Color temperature|2700|hexval}}"|2700

| 82

|-

| Standard [[LED]] Lamp

| 2700–5000

| style="background-color:#{{Color temperature|3850|hexval}}"|2700–5000

| 83

|-

| Quartz [[Metal-halide lamp|metal halide]]

| 4200

| style="background-color:#{{Color temperature|4200|hexval}}"|4200

| 85

|-

| Tri-phosphor cool-white [[Fluorescent lamp|fluorescent]]

| 4080

| style="background-color:#{{Color temperature|4080|hexval}}"|4080

| 89

|-

| High-CRI [[LED]] lamp (blue LED)

| 2700–5000

| style="background-color:#{{Color temperature|3850|hexval}}"|2700–5000

| 95

|-

| [[Ceramic discharge metal-halide lamp]]

| 5400

| style="background-color:#{{Color temperature|5400|hexval}}"|5400

| 96

|-

| Ultra-high-CRI [[LED]] lamp (violet LED)

| 2700–5000

| style="background-color:#{{Color temperature|3850|hexval}}"|2700–5000

| 99

|-

| [[Incandescent light bulb|Incandescent]]/[[Halogen lamp|halogen]] bulb

| 3200

| style="background-color:#{{Color temperature|3200|hexval}}"|3200

| 100

|}

A reference source, such as blackbody radiation, is defined as having a CRI of 100. This is why [[incandescent lamp]]s have that rating, as they are, in effect, almost blackbody radiators.<ref>{{Cite web |title=Blackbody Radiator - an overview {{!}} ScienceDirect Topics |url=https://www.sciencedirect.com/topics/engineering/blackbody-radiator |access-date=2022-03-13 |website=www.sciencedirect.com}}</ref><ref>{{Cite web |last=Fixtures |first=Access |date=2017-01-26 |title=CRI: What Is the Color Rendering Index? Is It Accurate? |url=https://www.accessfixtures.com/color-rendering-index/ |access-date=2022-03-13 |website=Access Fixtures |language=en-US}}</ref> The best possible faithfulness to a reference is specified by CRI&nbsp;= 100, while the very poorest is specified by a CRI below zero. A high CRI by itself does not imply a good rendition of color, because the reference itself may have an imbalanced SPD if it has an extreme color temperature.

== Special value: R9 ==