Office space usually needs a relatively uniform light distribution to provide comfortable and soft light for people's work, and the two most common lighting methods are direct lighting and indirect lighting.
Direct illumination
Direct lighting is the easiest way to meet the illuminance of the space, and the light evenly covers the horizontal areas such as our countertops, conference tables and the ground, which is an affordable lighting method.
Take one of the most common examples: the ceiling height of 2.8 meters, using 3×14W embedded T5 fluorescent lamp panel. The center distance of the luminaire is 2.4m×2.4m, which meets the uniform illumination of the desktop 300Lx. The advantage of this lighting method is that the minimum power consumption provides more light.
Everything has advantages and disadvantages, and direct lighting is of course no exception. Because the main direction of the light is directly from the top down, it is easy to produce a space cave feeling of dark ceiling and bright desktop. And the luminaire itself is high brightness, it is easy to produce a strong luminaire anti-bright spot on the computer monitor - called "light curtain reflection glare". Working in this environment for a long time is easy to cause visual fatigue. Therefore, we generally only use this method for middle and low grade office areas.
When we know the advantages and disadvantages of direct lighting, we can use the corresponding solution: using translucent materials such as acrylic plates or parabolic metal grilles to reduce the brightness of the luminaire surface. Flexible adjustment of the luminaire installation point relative to the display position, thereby reducing the chance of glare.
Indirect illumination
When designing space for high-end corporate offices, clients prefer to adopt a more lively space environment and create a relaxed environment.
The best working environment, of course, is to work under uniform natural light, usually, we will use the light slot to illuminate the ceiling outline, forming a simulated feeling of natural light. With the brightness of the ceiling, the space is no longer too simple, and there are certain decorative lighting effects and good visual feelings. However, the conventional frame light slot can only provide about 50Lx of illumination, and the light slot light can not illuminate the center of the ceiling, which is usually slightly insufficient for office space requiring 300Lx illumination. Additional lamps need to be added to illuminate the space.
We can assign the task of indirect lighting to the hoisting indirect lighting fixture, which is also the gist of the indirect lighting method of simulating the lamp slot, shining 90% to 100% of the light to the ceiling, and carrying out secondary reflection through the ceiling to illuminate the space more evenly. Different from the lamp slot, we can arrange the lamps at will, using dot matrix arrangement or line array arrangement to form a more orderly ceiling space.
We call this method of lighting "indirect lighting" and use this method to treat the space, provide a soft light environment, so that we can concentrate on the work, and the reflected glare on the screen is controlled. At the same time, the installation of lamps is less disturbed by the internal structure of the ceiling, and the installation is also a lot more convenient.
The disadvantage of indirect lighting is that it is easy to overlight the indoor ceiling, producing a sense of primary and secondary ignorance, and because the light is reflected twice, in order to meet the illuminance requirements, we need to use more power and pay more electricity. Therefore, the design needs to be considered according to the actual situation.
Semi-indirect illumination
It absorbs the spatial functional needs of direct lighting, meets our work lighting needs, and can also realize the secondary definition of space, showing the breadth of space, and better integration of heaven and earth. Semi-indirect lighting combines the advantages of both direct and indirect lighting, and is worthy of wide application in open office, independent office and residential study.
The semi-indirect lighting method can maintain the appropriate brightness ratio of the space, which is especially suitable for use in common open office areas.
In the selection of semi-indirect lighting fixtures, we should consider the glare control of the lower light, so as to reduce the discomfort of the glare above the user's head. With energy-efficient light sources and lamps, light distribution control through the corresponding optical devices can effectively eliminate the reflected glare of the screen, and will not produce excessive shadow on the physical performance of the object.
In terms of energy saving, semi-indirect lighting is between direct lighting and indirect lighting. The relationship between the power and illuminance of these lamps is different from the common experience value, and the guidance of professional manufacturers is required when using them.
In addition, it is worth reminding that indirect lighting and semi-indirect lighting have higher requirements for space height, generally requiring a ceiling height of more than 3 meters in space to meet the full diffusion of indirect lighting light.
