The shadowless surgical light is a vital light source in the operating room, directly related to the operation effect. In this article, we discuss the differences between Halogen Surgical Light and LED Surgical Light.
Halogen Surgical Light
Halogen lamp, also known as tungsten bulb, is a kind of incandescent lamp.
The principle is to inject halogen gas such as diabolium or bromine into the bulb. At high temperatures, the evaporated tungsten wire reacts with halogen chemically, and the evaporated tungsten will re-solidify on the tungsten wire, forming a balanced cycle to avoid premature breakage of the tungsten wire. Therefore, halogen bulbs last longer than incandescent bulbs.
In addition, halogen bulbs can also operate at a higher temperature than ordinary incandescent lamps, and their brightness and efficiency are higher. However, ordinary glass may soften at this temperature. Therefore, halogen bulbs need to use quartz glass with a higher melting point.
Phosphate endothermic glass is a glass with phosphorus pentoxide as the main component. It uses (PO4)3-tetrahedrons to connect to each other into a network, which has the characteristics of ultraviolet light penetration and low dispersion, but its chemical stability is poor, and it has greater corrosion to the refractory crucible during melting.
The traditional heat absorption system uses silicate glass as the heat absorption material, with visible light transmittance (60%-70%) and infrared absorption rate of 87%, and the color is distorted.
Using phosphate glass conforming to German (SCHOTT/KG3) standards and Japanese (HOYA/HA-30) standards as heat-absorbing materials, visible light transmittance (75%-83%) and infrared absorption rate (97%-99%) It is higher and greatly improves the light efficiency, so that the lamp reduces the heat in the surgical field.
Anodizing process of reflector
The so-called aluminum anodic oxidation is an electrolytic oxidation process in which the surface of aluminum and aluminum alloys is usually transformed into an oxide film, which has protective, decorative and other functional properties.
Blue coating process of reflector
The evaporative coating process is a method of heating and evaporating a certain substance to deposit it on the solid surface. This method was first proposed by M. Faraday in 1857, and it has become one of the commonly used coating techniques in modern times.
Evaporated substances such as metals, compounds, etc. are placed in a crucible or hung on a hot wire as the evaporation source, and the workpiece to be plated, such as metal, ceramic, plastic and other substrates, is placed in front of the crucible. After the system is evacuated to high vacuum, the crucible is heated to evaporate the contents. The atoms or molecules of the evaporated substance are deposited on the surface of the substrate in a condensed manner.
LED Surgical Light
LED light source
LED (Light Emitting Diode), a light-emitting diode, is a solid-state semiconductor device that can directly convert electricity into light.
The heart of the LED is a semiconductor chip. On a support, one end is the negative pole, and the other end is the positive pole connected to the power supply, so that the entire chip is encapsulated by epoxy resin. The semiconductor wafer is composed of two parts, one part is a P-type semiconductor, in which holes dominate, and the other end is an N-type semiconductor, which is mainly electrons.
But after the two semiconductors are connected, a “P-N junction” is formed between them. When the current acts on the chip through the wire, the electrons will be pushed to the P area, where the electrons and holes recombine, and then emit energy in the form of photons. This is the principle of LED light emission. The wavelength of light determines the color of light, which is determined by the material forming the P-N junction.