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Panel indicators and pilot lights are used when visual indication of machine or process status is required in the industrial, commercial, residential, and institutional application fields. Panel lights and pilot lights are used to indicate any condition that requires attention, and are available in various types depending on the application field and the working principle.

Types of Panel Lights

• Neon, Halogen, and Incandescent: These lights are used in all types of machines and processes where an ordinary electric light is suitable. These lights come in two forms: single and multiple lamps. Single lamps are used when the operation for which the lamp is used is not too complex, and multiple lamps are used when multiple indications are required.
• Fluorescent: Fluorescents are used in commercial applications, and are used in machines and processes where higher illumination levels are needed. These lights work by emitting electric current from electrodes on either side of the lamp and the current is converted to ultraviolet light which is then converted to visible light by a phosphor coating on the inside of the lamp. Fluorescents come in two forms: single and multiple lamps.
• Digital: Digital lights are used in the commercial and industrial applications where multiple indications are required. Digital lights are capable of displaying multiple digits or symbols, which helps indicate the precise status of a machine or process. They can be used to indicate various conditions, such as temperature, pressure, speed, current, voltage, etc. Digital lights are usually programmable and can be used to multiple parameters from a single light.
• Optical: Optical lights are used in machine and process control applications where high resolution is required. These lights are usually programmable and can be used to display multiple parameters from a single light and can be used to indicate any condition that requires attention. They are used in applications such as quality control, process monitoring, and operator feedback.

Working Principles of Panel Lights

Panel lights come in various types, as mentioned above, and each type has its own working principle. Each type of panel light works differently from the others, and the working principle depends on the type of light as well. Generally, panel lights work by means of an AC or DC voltage source, which is regulated by the user, and depending on the type of light, the electric current is used to generate the desired effect.

Neon and Halogen Lights

Neon and halogen lights work on a simple principle. These lights have a screw-in base, which is connected to a power source, and an inner bulb, which contains two electrodes. When the power source is connected, current passes through the electrodes and the gas in the bulb creates a glowing effect. The intensity of the glow can be altered by adjusting the voltage of the power source.

Incandescent Lights

Incandescent lights work on a similar principle to neon and halogen lights. These lights also have a screw-in base, which is connected to a power source, and an inner bulb, which contains a filament. When the power source is connected, an electric current passes through the filament, which heats up and generates light. The voltage of the power source is regulated to regulate the intensity of the light.

Fluorescent Lights

Fluorescent lights work on a completely different principle from incandescent and neon lights. These lights contain a tube filled with a mixture of mercury vapour and noble gases, and two electrodes. When the power source is connected, an electric current passes through the electrodes and excites the mercury particles, which emit ultraviolet light. This light is then converted to visible light by the phosphor coating on the inside of the tube.

Digital Lights

Digital lights work by means of a circuit board and an array of transistors which send signals to the display. When a user inputs an appropriate signal, the transistors send the specific signal to the display and the display will then show the desired number or symbol. Digital lights are typically used to indicate precise statuses of a machine or process.

Optical Lights

Optical lights work on a completely different principle from the other panel lights. These lights have a semiconductor chip which works as a light detector. When the input signal changes, the semiconductor chip detects the change in the signal and sends a signal to the LED, which then turns on or off. These lights are used to indicate any condition which requires attention.