Why This Dual-Color Turn Signal LED Exists

Many cars sold in India either do not have factory DRLs or use basic halogen indicator bulbs that look dated and offer limited daytime visibility. Retrofitting OEM DRLs is expensive, while aftermarket DRL kits often require bumper removal, extra controllers, and permanent wiring changes.

The TecUpdater 66 SMD 4014 Dual-Color LED Turn Signal Bulb solves this by combining white DRL and amber turn signal in a single bulb. It upgrades both appearance and safety without adding external DRL modules or modifying the headlamp housing.

Where This Bulb Is Used

This bulb is installed in the front turn signal / indicator position of the headlamp assembly. Once installed:

• The bulb works as a white DRL when ignition is ON

• Switches instantly to amber when the turn signal is activated

• Automatically returns to white after the indicator cycle ends

This behaviour is fully automatic and does not confuse other road users.

Dual-Color Switchback Working Explained

The bulb uses intelligent switchback logic:

• White DRL Mode (4.2W)
  Improves daytime visibility and gives the car a clean, modern OEM-style look.

• Amber Turn Signal Mode (25.2W)
  Overrides white instantly when the indicator is engaged, ensuring clear and legally correct signaling.

• Automatic Priority Logic
  Amber always takes priority over white, and DRL resumes only after signaling ends.

This makes the bulb safe, functional, and visually premium.

Connector Variants and Compatibility

The bulb is available in two widely used base types:

• PY21W / BAU15S / 1156
  Common in Volkswagen, Skoda, Hyundai, Tata, and many Indian-spec cars.

• T20 / 7440 / W21W
  Used in several Japanese and newer vehicles.

Compatibility depends on bulb holder type, not brand alone.

Installation Logic (Important)

• The bulb itself is plug and play in the indicator socket

• DRL function requires a simple wire tap to:

  • Ignition line

  • Parking lamp

  • Existing DRL power (if present)

No cutting of factory wiring is required. No external DRL controller is needed.

CANBUS Error-Free Operation

Standard LED bulbs often cause:

• Hyper-flash

• Bulb-out warnings

• Dashboard errors

This TecUpdater bulb includes built-in CANBUS resistance, ensuring:

• No warning lights on most modern cars

• Stable, flicker-free operation

• Correct indicator speed

Build Quality & Performance

• 66 × 4014 high-intensity SMD LEDs for uniform output

• 360° beam pattern for even reflector coverage

• Aluminium housing for effective heat dissipation

• Designed for long operating cycles without brightness drop

Who Should Buy This

This product is ideal if:

• Your car does not have factory DRLs

• You want DRL + indicator in one clean solution

• You want a modern OEM-style front lighting upgrade

• You want CANBUS-safe LEDs without extra modules

Who Should Not Buy This

This product is not suitable if:

• Your car already has dedicated factory DRLs

• You are looking for decorative RGB or show lighting

• You are unwilling to do a basic wire tap for DRL power

Real-World Use Cases

• DRL conversion for non-DRL vehicles

• Indicator brightness upgrade

• Clean headlamp aesthetic upgrade

• Custom automotive lighting projects