The conditions that an ideal illuminometer should possess
Small size and light weight (Compact Size, Light Weight)
The use of illuminometers is very extensive, and their timing is often in different places. Therefore, portable illuminometers with small cost and light weight are prerequisites.
● Accuracy
The quality of an illuminometer is related to its accuracy. Of course, it is also closely related to its price, so it is necessary to buy an accurate illuminometer at a reasonable price, generally with an error of no more than ± 15%.
Color Compensation
The types of light sources are diverse, with some focusing on longer wavelength red high-pressure lamps
, or shorter wavelength blue purple systems such as Daylight fluorescent lamps; There are also relatively evenly distributed incandescent light bulb series, where the sensitivity of the same illuminometer may vary slightly for different wavelengths, so moderate compensation is necessary.
● Cosine Compensation
As we all know, the brightness of the illuminated surface is related to the angle of incidence of the light source. Similarly, when using an illuminometer for measurement, the angle of incidence between the sensor and the light source naturally affects the reading of the illuminometer. So whether a good illuminometer has the function of cosine compensation cannot be ignored.
