01. Whether the beam angle can accurately meet the requirements of the application scenario
We can look at it from the perspective of a lighting designer. For example, if you need to highlight a product, you need to focus on the key light. If the beam angle is too large, only the basic lighting, but no key lighting, it will obviously lack visual appeal and cannot achieve the focusing effect. Of course, it is appropriate to use a mini spotlight at this time, but also pay attention to the beam angle.
For example, in general, the light at an angle of 10 ° is very focused and intense, which is like the stage chasing light. In contrast, the beam angle of 24 ° is less focused and has a certain visual impact. The beam angle of 38 ° has a large range of illumination, which is more suitable for basic lighting. Therefore, under the same power, same projection angle and distance, if you want to focus on lighting, you prefer to use a 24 ° beam angle.
Of course, the specific beam angle to be used depends on the power, projection angle, distance of the lamp and the size of the object to be illuminated. Whether the lamp you want to evaluate can accurately achieve the angle you want will be one of the factors to be considered when purchasing the lamp.
02. Evaluation from the angle of illuminance, glare and secondary facula
In commercial lighting, why do some lighting methods make customers feel uncomfortable? Or can't the characteristics of the product be displayed correctly? This is related to illumination and glare.
In commercial places, controlling the ratio of basic illumination to key illumination can produce various effects. Among them, precise light control technology is required. At present, the most commonly used light control method is COB+lens+reflection.
At the early stage of LED development, the most commonly used light control method is the use of astigmatic plates, which has the advantage of high efficiency, but unfortunately, it is almost impossible to control the direction of light, and will also produce glare. Therefore, this method, strictly speaking, can not really achieve accurate light control. Later, the industry began to use large lens refraction. The advantage is that the beam angle and direction can be controlled at first, but the utilization rate is low, and narrow beam design is difficult. In addition, glare still exists.
Later, an advanced method emerged, which uses reflective cups to control the light of COB LED. The design of this method is relatively mature, but the disadvantage is still that the light utilization rate is low, and a new problem, secondary spot, has emerged.
In order to solve the above problems, the ideal COB LED light control mode was born: lens plus reflector. It can not only control the beam direction, but also improve the utilization rate and reduce the glare. The key is to solve the problem of secondary spot.
Therefore, among the optical design methods of lamps, at least the way of lens plus reflector can be used to achieve better light output effect. At present, the excellent scheme is to use TIR+Fresnel lens to create a beautiful light pattern, make perfect use of light, and achieve a light output efficiency of up to 90%.
03. Observe the material, temperature resistance, light transmittance and weather resistance of optical components
From the lens point of view, the current mainstream material in the market is PMMA (Acrylic), which has good plasticity and high light transmittance (more than 93% when the thickness is 3mm), and is particularly suitable for places such as commercial lighting that require high light quality.
If you have any questions about the design of commercial lighting environment , please consult seeposh.