The ISO 12647 standard establishes
Strict quality parameters throughout the complete digital workflow in the graphic arts industry. Besides existing technical measuring procedures for color control, the visual control of printed products plays a decisive role. This is why standardized light conditions complying with ISO 3664:2009 are fundamental to prevent discrepancies in color assessment.

Choosing the right fluorescent tube is critical to create the right light conditions for color evaluation purposes.

The high quality fluorescent tubes, JUST daylight 5000 proGraphic, create optimum viewing conditions for critical color assessment.
The only fluorescent tube on the market that fully complies with the critical demands of ISO 3664:2009 in terms of:

• Color coordinates：
  Tolerance of only 0,005 and an even distribution of spectral lines.
• Color temperature：
  5000 Kelvin and a high color rendering value of Ra8 > 98 (exceeding the established value of Ra > 90).
• Metameric index：
  By far lower than 1.
• Innovative production process：
  The only fluorescent tubes on the market to be produced with a 4-band technology. Light color is produced with 4 different phosphors, thus greatly improving spectral properties.
• Certified light quality：
  Every daylight 5000 proGraphic tube is accompanied by a measuring certificate which verifies its exceptional light quality.
• No. 1 in environmental awareness：
  JUST is again a step ahead when it comes to environment protection: daylight 5000 proGraphic contains less than 5 mg mercury in each tube.
• Technical consultancy：
  Our qualified experts will be glad to evaluate the light conditions in your workplace.

       Automatic warning for relamping after 2500 hours of light bulb use. Green light indicates: up to 2300 hours of use, tubes are within ISO 3664:2009 compliance. Yellow light: Less than 200 hours of use remaining, order replacement tubes. Red Light: Replace tubes!

       After 2500 hours of service, fluorescent tubes diminish their color temperature. In order to provide consistently accurate and reliable viewing conditions, JUST Normlicht requires relamping every 2500 hours.

       Simply mark the next date for relamping on the attached label according to the following schedule: Single shift = once per year, two shifts = every 6 months, three shifts = every 4 months.

       Simply mark the time limit on the attached relampinglabel by adding 2500 to the number of actual service hours.