What is the Approximate Amperage Draw of the ST70RB Sealed Oval Trailer Light
Published 05/02/2011
Question:
looking the amp draw is for the ST70RB light
asked by: Michael
Expert Reply:
The Sealed Oval Trailer Stop, Turn and Tail Light, item # ST70RB, uses an 1157 automotive style bulb with two filaments. The bright filament is rated at 21 watts and the dim filament is rated at 5 to 6 watts.
With the filament wattage, we can determine the amp draw of the bulb. Amperage equals watt rating divided by input voltage. Assuming a 12.8 volts input in all cases, with both filaments lit, the amperage draw would be approximately 2.1 amps. With only the dim filament lit, the amp draw would be approximately .5 amps, and with the bright filament only lit, the amperage draw would be approximately 1.6 amps.
These figures are mathematical and related to the bulb only, the wiring and socket the bulb is attached to will play a role in actual amperage draw figures.
Product Page this Question was Asked From
Optronics Trailer Tail Light - Stop, Turn, Tail - Submersible - Incandescent - Oval - Red Lens
- Trailer Lights
- Tail Lights
- Brake/Tail/Turn
- Oval
- Recessed Mount
- Submersible Lights
- Incandescent Light
- 6-1/2L x 2-1/4W Inch
- Red
- Optronics
more information >
Continue Researching
- Search Results: aluminum roof vent
- Search Results: interior lights
- Search Results: moon
- Search Results: dome light rv interior lights
- Search Results: bk5~100
- Search Results: 008~285~08
- Search Results: interior
- Shop: Replacement Exterior Pop-Up Roof Vent - Aluminum - 13-1/2" x 8"
- Shop: Replacement Base for B&W Companion OEM 5th Wheel Trailer Hitch for Ford Super Duty
- Shop: Fifth Wheel Hitch
- Shop: B&W Companion OEM 5th Wheel Hitch for Chevy/GMC Towing Prep Package - Dual Jaw - 25,000 lbs
- Shop: Dexter BrakeRite Electric Over Hydraulic Actuator for Disc Brakes - Vented - 1,500 psi
- Shop: BoatBuckle Heavy Duty Ratchet Transom Tie-Down Straps - 2" x 4' - 833 lbs - Qty 2
- Shop: BoatBuckle Kwik-Lok Transom Tie-Down Straps - 2" x 2' - 400 lbs - Qty 2
- Shop: Dexter Trailer Hub and Drum for 8,000-lb E-Z Lube Axles - 12-1/4" Diameter - 8 on 6-1/2
- Video: Let’s Check Out the 2-1/2" Long Standard Torx Trailer Floor and Wall Liner Screw
- Q&A: Replacement Double Lip Grease Seal for National Seal 471750
- Q&A: Comparing the Power Draw of LED Trailer Tail Light STL8RB and Incandescent Version ST8RB
- Article: Trailer Wiring Diagrams
- Shop: Trailer Hitch
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Shop: Trailer Wiring
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Installation Time for Blue Ox BX1128 Flat Tow Base Plate Kit for 2016 Jeep Grand Cherokee
- Shop: Suspension Enhancement
- Article: How to Measure for Trailer Hitch Drop
- Video: B&W Companion OEM 5th Wheel Hitch Manufacturer Breakdown
- Q&A: Does etrailer Carry Furrion Chill Cube w/ Heat Pump to Replace Dometic Duo-Therm
- Shop: Brake Controller
on Trailer Lights
