#shadowless lamp

Actually CRI is not a perfect indicator of color quality, as it has some limitations and criticisms. 1. CRI only uses eight color samples, which are mostly pastel colors and do not represent the full range of colors in the real world. Some light sources may have high CRI values for these samples, but low CRI values for other colors, such as saturated or skin tones. To address this issue, some additional color samples have been added to the CRI calculation, such as the R9 sample for red colors in Mingtai shadowless lamp and the R15 sample for skin tones. However, these samples are not widely used or reported by manufacturers. 2. CRI does not account for the color preference or adaptation of human vision. Some light sources may have low CRI values, but still produce pleasing or preferred colors for certain applications or environments. For example, some people may prefer warmer or cooler colors than the reference light source, or may adjust their perception of colors based on the context or the surroundings. CRI does not reflect these subjective factors, and may not correlate well with the color satisfaction or acceptance of users. 3. CRI does not consider the brightness or the color temperature of the light source, which can also affect the color appearance and perception. Some light sources may have high CRI values, but still produce dim or harsh colors for certain situations or tasks. For example, some LED lights may have high CRI values, but low luminous efficacy or high correlated color temperature, which can reduce the visibility or comfort of users. CRI does not capture these aspects, and may not correlate well with the color performance or functionality of the light source.

CRI is a numerical measure of how well a light source can reveal the true colors of objects compared to a natural or standard light source.

CRI is calculated by comparing the appearance of eight standard color samples under a test light source and a reference light source. The reference light source can be either daylight or a black body radiator, depending on the color temperature of the test light source. The color appearance of each sample is measured by a colorimeter or a spectroradiometer, and the color difference is calculated by using a formula based on the CIE 1931 color space. The average color difference of the eight samples is then subtracted from 100 to obtain the CRI value.

CRI values range from 0 to 100, with 100 being the best possible score. A higher CRI means that Mingtai shadowless lamp source can render colors more accurately and naturally, while a lower CRI means that the light source can distort or dull colors. Generally, a CRI of 90 or above is considered excellent, a CRI of 80 or above is considered good, and a CRI below 80 is considered poor. However, CRI is not a perfect indicator of color quality, as it has some limitations and criticisms.

During the preparation phase, the nurse (or doctor) will move mingtai shadowless lamp to the approximate position of the operation area. Then turn on the lamp. At this time, the doctor will usually stand under the operating lamp, with the back of the head facing the lamp cap, and then reach out to hold the sterile handle in the middle of the lamp cap, watch the light spot formed by the light in the operation area, and slowly adjust the lamp cap. Position until the surgical field has a more satisfactory lighting environment.

After starting the operation, the position of the operating light will not change. However, when the depth of the surgical field incision or the position of the surgical field changes, it needs to be adjusted. At this time, the doctor can fine-tune the position of the lamp holder through the sterile handle to obtain clearer surgical field lighting. Finally, after a long-term operation is over, the nurse (or doctor) removes the lamp head to the outside of the operation area, removes the sterile handle, and disinfects it.

From the above process, we can see that the main users of surgical lamps are doctors and nurses. Before and after each operation, the nurse needs to move the surgical lamp a long distance. For doctors, during the operation, whether the surgeon or the assistant, basically stand under the shadowless lamp, and keep in close contact with the shadowless lamp for a long time.

When hospital receive operating light, how to properly install and adjust it became a prerequisite for the successful operation of the surgery in the future. Now most operating lights are ceiling operating light, engineer should strictly follow each indicator during installation, including LED surgery shadowless lamp mechanical installation inspection, circuit inspection, balance arm inspection, joint flexibility, exposure depth, and color temperature.

Mechanical installation check

Check whether there are mechanical installation flaws, whether the screws is less or not tight, whether the circlip is stuck, whether each cover is covered well.

Circuit check

First check whether the system is short circuit or open circuit, if everything is ok, power test can be done, check whether the external power supply is stable, whether transformer output voltage is too high or too low.

Balance arm inspection

Check whether the balance arm and the lamp head are matching, whether the balance arm force and angle should be adjusted.

Joint flexibility adjustment

Mainly adjust the joint damping screws, the standard stipulates that the degree of tightness of the damping adjustment is close to 20N or 5Nm when push or rotate the joint at any position.

Adjust and open joint limit switch

In order to facilitate the LED surgery light installation and transportation, most surgery lamp set lock switch or limit switch in its key components such as joints, now open it.

Check the irradiation distance and depth

Most surgery lamp irradiation distance is between 70-140cm or 60-130cm, that means surgery lamp works best in this distance.

Check illuminance and color temperature

Illuminance and color temperature are described for LED operating light irradiation intensity. Usually the best surgery light is similar to sunlight, that is around 4300-4600K.

Other tips should be noticed

The roof surface must be able to withstand a load of 500kg.

Ceiling height greater than 3.2M, bracket should be added (can be ordered from Mingtai company)

The user's ground wire should be reliably connected to the product's ground terminal (yellow-green line).