PUMAS01 wrote: If the intensity at the workplace is to be taken from the standards, none of it because the standards are given in lux, and here the measurement results are expressed as a percentage of the outdoor daylight intensity. and what to do with it?
Buddy, please

You are to ensure that the lighting in the facility meets the minimum and standard requirements for the requirements of a given job or position.
Is daylight required by the regulation? is. It's enough? no or yes, additional electric lighting must be provided.
Let's read the entire regulation:
Quote:
§ 57. 1. The room intended for the stay of people should be provided with daylight, adapted to its purpose, shape and size, taking into account the conditions specified in § 13 and in the general provisions
occupational health and safety.
2. In a room intended for people, the ratio of the window area, calculated in the light of the door frames, to the floor area should be at least 1: 8, while in another room where daylight
is required for purpose - at least 1:12.
§ 58. 1. It is allowed to illuminate the room intended for people only with artificial light, if:
1) daylight lighting is not necessary or it is not advisable for technological reasons;
2) is justified by the functional expediency of locating this room in an underground facility or in a part of the building without daylight.
2. If the room referred to in sec. 1, is a permanent work room within the meaning of the general provisions on health and safety at work, for the use of artificial lighting only, including electric, it is required to obtain the consent of the competent state provincial sanitary inspector, issued in consultation with the competent district labor inspector.
3. The arrangement referred to in para. 2, does not apply to buildings for state defense.
§ 59. 1. The rooms intended for people and for general traffic (communication) should be provided with artificial lighting according to the utility needs.
2. General artificial lighting of a room intended for permanent residence of people should ensure appropriate conditions for the use of its entire surface.
3. Lighting with artificial light of interconnected rooms intended for permanent stay of people and general travel (communication) should not show differences in intensity, causing glare at the passage between these rooms.
Now let's move on to the provisions of the health and safety requirements:
Quote:
§ 10.1 In all places on the premises of the workplace where employees may stay, the employer is obliged to provide electric lighting at night. or if daylight lighting is insufficient. The lighting requirements are defined by Polish Standards.
2. Electrical installations and devices should be made and operated in such a way that they do not expose workers to electric shock, atmospheric surges, harmful effects of electromagnetic fields, and do not constitute a fire or explosion hazard and do not cause other harmful effects.
And further:
§ 15.1. Workrooms and their equipment should provide employees with safe and hygienic working conditions. In particular, natural and artificial lighting should be provided in work rooms , appropriate temperature, air exchange and protection against moisture, unfavorable thermal conditions and sunlight, vibrations and other factors harmful to health and nuisance.
And additionally:
Chapter 2
Lighting
§ 25 In the premises of permanent work, daylight should be provided, unless it is impossible or inappropriate due to the production technology, and the employer has obtained the consent of the competent provincial state sanitary inspector issued in consultation with the district labor inspector for the use of only electric lighting.
§ 26.1. Day lighting at individual workplaces should be adapted to the type of work performed and the required accuracy, and should meet the requirements specified in the Polish Standard.
2. Irrespective of the daylight, electric lighting should be provided in workplaces with parameters consistent with Polish Standards.
§ 27.1. The ratio of the average values of illuminance in adjacent rooms through which internal communication takes place, should not be greater than 5 to 1.
2.When leaving the rooms where, for technological reasons, work is performed in the dark (e.g. dark optical), the conditions should be ensured enabling a gradual adaptation of the eyesight.
§ 28 In rooms and workplaces where, in the event of a lighting failure, there may be threats to the life or health of employees, emergency lighting of appropriate intensity should be provided, in accordance with the Polish Standard.
§ 28a. Lighting installations in rooms where there are workplaces and in corridors should be selected and made so as not to expose the employee to an accident caused by the type of lighting installed.
§ 29.1. Windows, skylights and skylights in work rooms with high air humidity should be made in a way preventing condensation of water vapor. In the event of particularly large mist in the room and the possibility of water drops falling onto the workplace, gutters or other devices draining water from windows, skylights and skylights should be installed.
2. Glass in windows and skylights should be clean and let a sufficient amount of light pass through. Convenient and safe access should be provided for cleaning windows and skylights.
3. Windows and skylights should be equipped with appropriate devices to eliminate excessive exposure to sunlight falling on the workplace.
4. Windows and skylights intended for ventilation of rooms should be equipped with devices allowing for openingthem easily and safely from the floor and setting the opening parts in the desired position.
So you have to check the intensity in the object at the given points and compare it with the requirements of the standard.
Any conversion of external intensity into internal one is a complete lack of understanding of the subject. I found it only in the subject of lighting parameter settings, curtains inclination and other goodies for lighting control depending on the position of the sun and electricity savings.