COB LED 4V Strip DC 135×17mm Super Bright Linear COB Light for Emergency, Torch & DIY RS01-COB

Specifications  

• COB LED 4V
• Type: Linear COB LED  
• Voltage: 3.7–4.2V DC  
• Current: 400–600mA (depending on brightness)  
• Power: ≈2–2.5W  
• Size: 135mm (L) × 17mm (W) × 2mm (T)  
• Color: Cool White 6000–6500K  
• Luminous Flux: >500 lumens (estimated)  
• Beam Angle: 180°  
• PCB Material: Aluminum substrate  
• Polarity: Clearly marked + and – pads  
• Lifespan: >20,000 hours  
• Operating Temperature: -20°C to +60°C 

• 

Features  

• Super bright linear COB LED (no individual dots)  
• Operating voltage: 3.7–4.2V DC (perfect for single Li-ion battery)  
• Size: 135mm × 17mm × 2mm  
• Color temperature: Pure white 6000–6500K  
• High luminous efficiency – very bright even at low voltage  
• Uniform light distribution, no dark spots  
• Easy to solder with + and – pads  
• Ideal for emergency bulbs, rechargeable torches, bike lights & solar projects 
• This 135×17mm 4V COB LED strip is currently the brightest and most popular choice for emergency lights, rechargeable torches, solar lanterns, bike headlights, and DIY lighting projects in Bangladesh. Unlike traditional SMD LEDs, COB technology gives completely uniform light without any dots or shadows – perfect for close-range bright illumination.
• Runs directly on a single 18650 or 3.7V Li-ion battery (no driver needed). Just connect + and – wires and get instant super-bright pure white light. Widely used by emergency light manufacturers and hobbyists. Get original high-quality COB LED at the lowest price only at Dunia BD with same-day shipping across Bangladesh.

What is the price of COB LED 4V Strip DC 135×17mm Super Bright Linear COB Light for Emergency, Torch & DIY in Bangladesh?

The latest price of 4v COB LED DC in Bangladesh is Price: ৳57.50 taka for 1Pcs . You can buy this product at better and cheaper price from our website and also you can visit our warehouse between work hours 10am to 8pm.

Buy COB LED 4V Strip DC 135×17mm Super Bright Linear COB Light for Emergency, Torch & DIY in Bangladesh from online at Dunia.com.bd.

In Bangladesh, you can get original 4v COB LED DC From Dunia.com.bd . We have few collection of latest COB LED to purchase. Order LED Encapsulation Series Online at our website Or Visit our warehouse to get your product at lowest price.

FAQ  

1. Can I run it directly on a 3.7V 18650 battery? 
   Yes, perfect match – no driver or resistor needed.
2. How bright is it? 
   Extremely bright – over 500 lumens, enough to light a full room.
3. Will it get hot? 
   Gets warm but needs a small heatsink for continuous use >10 minutes.
4. What color is the light?
   Pure cool white (6000–6500K).
5. Can I cut it?
   No, it’s a single COB chip – cannot be cut.
6. Does it need a driver circuit?
   No, direct 4V DC connection is enough.
7. Is it suitable for emergency bulbs?
   Yes, most 4V emergency lights use this exact COB.
8. How to connect wires?
   Just solder on the + and – pads.
9. Do you sell in wholesale?
   Yes, special bulk price for 50+ pieces.
10. Warranty? 
    No warranty.