ILLUMINANCE / LUX
Illuminance is measured in lux. This value indicates how much light from the total amount of light emitted actually reaches a certain point. For changing room mirrors, the illuminance of the light source is measured at a distance of 70 cm in front of the mirror at chest height. For perfect illumination from head to toe, lyz has an illuminance of 500 - 600 lux, which, according to a study, produces the ideal level of illumination without the customer finding it unpleasant, glaring or dazzling. The illuminance depends not only on the output of the lamp, but also on reflections off of a light or dark surface. This means that the brighter the main colour of the changing room walls, the more light the lyz reflects and, if bright enough, it can even light the entire changing room.
LIGHT-EMITTING DIODE / LED
LED stands for ‘light-emitting diode’. It is the lamp “of today” and will continue to be so in the future, as huge technological strides have been made in recent years. This is why we primarily use LEDs in our lighting mirrors.
A LED consists of a LED chip, a reflector with a contact touching the negative pole (cathode), a gold wire with a contact touching the positive pole (anode) and a plastic lens that combines all of the components. LED lighting technology has many advantages. They are slender, extremely energy efficient and do not contain mercury or other harmful substances. This is why lyz exclusively uses high-quality LEDs. The change in lighting colours is created by a dual-strip construction, each with 120 cold and warm diodes per metre positioned directly next to each other.
COLOUR TEMPERATURE / KELVIN
The colour temperature is measured in Kelvins. Light can range from warm to cold. The higher the percentage of red in the light, the warmer the light appears to be. Conversely, the higher the percentage of blue, the colder it appears.
With its mixed light of around 4,000 Kelvin, the “daylook” setting is recommended for customers choosing business or casual outfits for wearing in the bright hours of daylight. The “nightlook” allows the customer to simulate evening lighting. This warm light has a colour temperature of around 2,800 Kelvin and is therefore very similar to the lighting of a restaurant or bar. The “colourcheck” setting with a colour temperature of around 5,500 Kelvin is particularly suitable for choosing the colour of a garment when in a changing room. The colour percentages of this cold light do not change the colour of the garment in the customer’s reflection.
COLOUR RENDERING INDEX / CRI
The colour rendering index is a photometric measurement to determine the colour impression of an illuminated object. True colour reproduction is often critical, especially with red and dark blue tones. This index describes the quality of the composition of the white light being emitted by a lamp and is measured in CRI. CRI stands for Colour Rendering Index and produces a value between 0 and 100 (corresponding to natural sunlight). The higher this value, the more accurately the lamp illuminates the colour. LEDs generally have a CRI value between 80 and 97. The lyz for fashion changing room mirror uses a LED solution that produces a CRI value of 93, so it reflects a particularly accurate representation of colours, even of red tones. This is particularly important for accurately reflecting the colours of garments being tried on in changing rooms.