-Color rendering index
The CRI is measured in 8 colors
(standard procedure Ra)
To evaluate the color of a lamp CRI-rendering according to the procedure of the International Commission on illumination (CIE), used a palette of 8 colors (R1 to R8). For each color, comparing rendering under the lamp under test and an ideal light. Assigned CRI finally to the lamp is an average of 8 renderings of these 8 colors-tests.
Because this procedure has been developed in the 1950s to test fluorescent lamps and discharge lamps, it is ill-suited to the LED lighting that have emerged recently. To adapt the test to the LED and refine it, some lighting professionals use in addition to the already mentioned 8 colors-7 other colors (R9 to R15).
See (or not) all colors
This index (not to be confused with the color temperature) defines the ability of a lamp to distinguish colours. The maximum value of CRI is 100.
The light of the day offers a CRI of 100. Incandescent and halogen bulbs (whose light has a continuous spectrum) also have a close to 100 CRI, even if the color of their light pull on the yellow. On the other hand, the CRI of the majority of fluorescent lamps and LED lamps that are present on the market is around 80. But, in both categories, there are models with CRI greater than 90 (very good color rendering) or below 70 (poor color rendering).
The CRI of fluorescent lamps
On fluorescent lamps (“Thrifty” CFL bulbs and light tubes / neon), CRI is often indicated by using a three-digit code that combines CRI and the color temperature. Only the first digit relates to the CRI .
Fluorescent lamps that offer a very good record of 90-100 CRI colors (codes 930, 940, 950…) however have a less good light output and are in category B of the energy label. The category CRI 80-89 (codes 827, 830, 840…) have a good color rendering and are suitable for housing and office. However, their CRI isn’t enough for tasks where color is important (graphics, clothing, jewelry, medicine, etc.)
Should book the lamps with CRI 70-79 (code 730, 740… or the manufacturer-specific code) for the corridors, and those with an CRI 60-69 or less (630, 640… codes or manufacturer-specific code) to illuminate the garage or cellar. The light tubes with a small CRI are often marked “standard”.
The CRI of LED lamps
LED lamps available in supermarkets have generally an CRI located between 75 and 85 – some bulbs with standard Cap reaches even 90-92. On the professional market, there is lighting led with an CRI up to 98.
Standard procedure to set the CRI to a lamp was designed in the 1950s to characterize fluorescent lighting and lamps to discharge used especially for public lighting. It is not well suited to the LEDs whose luminous spectrum is very different (see spectrum of lighting lamps). Thus, an LED with a KPI of 80 bulb can offer a more pleasant light than a CFL with the same CRI . Isn’t that comparing lamps at home we can realize.
More information on CRI
- The ‘CRI does not improve if you install two same mediocre lamps instead of one.
- Color temperature and color rendering index-CRI are two different things well that related: this isn’t because a tube light or led bears the mention “Light of day” she necessarily has the ability to make all the colors.
Development CRI low does not mean that all the colors are generally less well made: some colors may become indistinguables them (for example different shades of green) while others are well defined.
- Deux different lamps with the same CRI do not necessarily have the same weaknesses of color rendering. Thus, a CFL and an LED bulb can produce together a more pleasant light that two bulbs of the same type (to try with same color temperature bulbs).
- On also uses CRI to characterize the glazing of buildings and vehicles. Indeed, the glasses are not fully transparent and they can be fitted with metal layers that filter the light – for example to avoid sun damage items on display in a showcase, or it overheats a desk or inside of a car.
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