Indicator Light

What Is an Indicator Light?

An indicator light, also called a LED indicator light, pilot light, or panel indicator light, is a visual signaling device used in electrical equipment, industrial machinery, automation systems, vehicles, and electronic devices.

Indicator lights provide instant visual feedback about machine or system status, including:

• Power ON/OFF
• Machine running status
• Warning or fault alarms
• Standby mode
• Emergency stop conditions
• Low voltage or overheating alerts

Modern LED indicator lights offer high brightness, low power consumption, vibration resistance, and long service life exceeding 50,000 hours.

They are widely used in:

• Industrial control panels
• CNC machines
• Automation equipment
• Automotive dashboards
• Marine systems
• Medical equipment
• Power distribution cabinets
• Home appliances

How to Choose the Right Indicator Light

1. Mounting Hole Size

The mounting diameter determines compatibility with your control panel or equipment enclosure.

• 6mm–10mm: Compact electronics and instruments
• 12mm–16mm: Industrial control panels
• 19mm–22mm: Heavy-duty machinery

Most common sizes: 8mm, 12mm, 16mm, 19mm, and 22mm indicator lights.

2. Operating Voltage

• 12V / 24V DC: Automotive and battery systems
• 110V / 220V AC: Industrial machinery and appliances

Using the wrong voltage may damage the LED or reduce brightness.

3. Housing Material

• Metal indicator lights: Durable, anti-vandal, corrosion-resistant
• Plastic indicator lights: Lightweight and economical

4. Waterproof Rating

• IP65: Dustproof and water-resistant
• IP67: Waterproof for harsh environments

Waterproof LED indicator lights are ideal for outdoor, marine, and industrial applications.

5. LED Color Meaning

• 🔴 Red: Fault or danger
• 🟢 Green: Normal operation
• 🟡 Yellow: Warning or standby
• 🔵 Blue: Manual mode or reset
• ⚪ White: Power ON

6. Lens Shape

• Flat Head: Flush and modern appearance
• Concave Head: Focused illumination
• High Head: Wide viewing angle

FAQ About Indicator Lights