Standardised compliant viewing conditions are crucial to visual colour assessment – this is achieved through a careful balance of several factors (not just a light bulb that says daylight). The temperature and CRI (spectral quality) of the light source is a key component as is the avoidance of unwanted reflections. Additionally, the intensity of the illumination and uniformity over the entire spectrally neutral viewing surface is crucial. Without all criteria being achieved it is not possible to make a valid visual colour assessment.
Thanks to market leader JUST Normlicht, the LED era of D50/D65 certified ISO standardised viewing lamp technology has arrived in the form of its proprietary DLS (Digital Light System) technology. This innovative Just Normlicht DLS technology is available as stand-alone luminaires in multiple sizes, or as part of a complete JUST Normlicht viewing cabinet. Also available as upgrade units for existing Just Normlicht solutions and retrofit upgrades for other viewing solutions.
The continuous high light quality of the DLS panels exceeds compliance to ISO 3664:2009 and ISO 3668 viewing standards. The DLS specification combined with Fresnel-type prismatic lens provides a harmonious, glare/reflection-free, full light spectrum – superior to what can be achieved from conventional fluorescent daylight lamps.
Configurations comply with archiving a uniform illumination intensity of 2,000 Lux for physical colour comparisons and the dimmer switch functionality in all models offers incremental dimming allowing for compliance to soft-proofing illumination standards of 500 lux and lower.
Requirements and viewing configurations evolve over time, so please browse the online product range, but also Contact Us with an outline of your requirements - enabling us to advise on the most suitable configurations. The following requirements need to be considered:
- Subject - For viewing flat sheets, 3D product (what type), or both
- Size - Maximum sheet and/or product size to be viewed
- Illumination types - DLS standard D50/D65 daylight (inc/ex UV) and UV only for general print-work, or to also include LED-B1 home-light and LED-B2/B3 store-light for product colour appearance visual assessment
- Format - Floor-standing with/without storage, desktop, inline/console, vertical wall illumination, or complete viewing room
Or, for straight upgrades please advise of the current model, size and illumination type
Features of JUST Normlicht DLS include:
- Proprietary DLS (LED) light technology by JUST, Fogra certified to ISO 3664:2009, Pat. No. US 8,592,748 B2
- Switchable light: D50 and D65 according to ISO 3664 and ISO 3668
- UV content can be enabled or disabled for either illuminant regarding new and old ISO standard
- Dimming and USB connection for soft proofing applications
- No colour shifts while dimming
- No preheating after turning on
- Annual re-lamping not required
- 20x longer operating life compared to fluorescent lamps (> 50.000 h)
- Stable light output during the entire lifespan
- Environmentally-friendly
JUST Normlicht DLS Specification – D50/D65/UV
- 2000 lux illuminance according to ISO standard
- Colour Rendering Index (CRI) Ra ≥ 95
- Exact colour coordinates (10°):
D50: x = 0.3478 / y = 0.3595 (≤ 0,002)
D65: x = 0.3138 / y = 0.3309 (≤ 0,002) - Low metamerism index in the visible range: ≤ 0.8 (MIvis)
- Low metamerism index in the UV range: ≤ 0.6 (MIuv)