Sign up or log in to customize your list. Here's how it works: Anybody can ask a question The best answers are voted up and rise to the top I'm building tail lights for an old car. They're going to be as simple as possible, high intensity LEDs and resistors to bring down the ~5.5 volts the car supplies to about 2.2. The car originally used a dual filament bulb, a dim filament for running lights and a bright one for brake lights. I want to use the same LEDs for both brake and running lights, with all of the LEDs being activated at all times. Dim when just running and bright when you hit the brakes. The car just runs two +5.5 volt wires to the bulb and they share a common ground. What's the simplest workable solution? A standard 1157 dual-filament tail light bulb has a lumen ratio between brake/turn signal and running light filaments of about 10:1 (402:38 lumens). Since the forward voltage of the LED won't change much and the vehicle electrical system voltage is fixed, and since LEDs are fairly linear lumens per ampere, you can simply use resistors in about a 10:1 ratio (actually a bit more since you're using a 6V electrical system and the LED voltage will increase a bit at 10x the current).

Another way would be to use multiple LEDs and power only some of them, at the same or at reduced current. Taking a typical power COB LED datasheet, forward voltage is 2.25V typical at 350mA, so if you decide to run it at 250mA/25mA you'd use resistors of about 20 ohms/200 ohms. You can't compare lumens directly because the LEDs are more directional than the incandescent bulbs and the filter absorbs a lot of the light (everything that isn't red). Note: I've assumed the '6V' vehicle electrical system runs at about 7V with the engine operating. I suggest picking the low value resistor to give the maximum current you want (if the brightness isn't good enough, add LEDs/resistors or use better LEDs) and pick the higher value to reduce the run light brightness to the correct value. The higher value resistors will be small and cheap. Use different value resistors for running and brake lights. (The resistor values in the schematic are just examples to show the principle). simulate this circuit – Schematic created using CircuitLab

Sign up or log in Sign up using Google Sign up using Email and Password Post as a guest By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged led resistors control or ask your own question. Ships from and sold by 3rdbrakeflasher. See more product details New (1) from $19.95 + $4.52 shipping Vehicle Brake Light Flasher Module. Safety Flash Light Alert. For Motorcycles and Cars. Brake light blinker, four flashes then solid. Special Offers and Product Promotions Save 25% each on Qualifying items offered by 3rdbrakeflasher when you purchase 4 or more. Here's how (restrictions apply) 0.5 x 0.5 x 0.1 inches 4.6 out of 5 stars #29,993 in Automotive (See top 100) #17 in Automotive > Replacement Parts > Lighting & Electrical > Electrical > Flashers #205 in Automotive > Light & Lighting Accessories > Lighting Assemblies & Accessories > Signal Light Assemblies

#2,439 in Automotive > Replacement Parts > Body & Trim > Bodymotorcycle shop keene nh 0.8 ounces (View shipping rates and policies)motorcycle repair bowling green ky Product Warranty: For warranty information about this product, please click heremotorcycle shops in waterford michigan If you are a seller for this product, would you like to suggest updates through seller support?zegna sport leather motorcycle jacket Would you like to tell us about a lower price? Microprocessor based safety alert device. Flasher connects to existing third brake light and generates light flashing affect to alert those behind you when the brakes are activated.

Number of flasher, rate , mode , reactivation and other parameters are controlled and configured by user. Installation: Simple, three wires to connect. How to change modes: Flasher has two white control wires. By shorting the wires and following instruction you will configure all the flasher parameters which then will be stored in internal flash memory. One time set and forget. We are manufacture of the product so you are getting product right from the source with LifeTime warranty. No other flashers on the market has more functionality, smaller package. Multi mode flasher, user configurable. Works on both LED and INCANDESCENT brake lights. Rated upto 100 watt (8 amp). Download manual from: http://bit.ly/flashm1doc We also sell Stop Alert with built-in brake force sensor. Search for : Vehicle Brake Light Flasher Module with Brake Force Trigger. See questions and answers See all verified purchase reviews Installed on a 2012 Pilot to flash the 3rd high mount brake light. At the fastest setting, it appears to flash at 10Hz (10 times a second) so I have mine set to flash 3 times at that rate.

Appears to match the same being used by CHP motorbikes that also flash their rear taillight upon braking.To make the flashing work at 10Hz, I had to upgrade the five 168 bulbs to LED. I used 194 LED Light bulb, Yorkim® 6th Generation,12V Lights for 168, 2825,T10 5-SMD LED Bulb, Replacement and Reverse White Bulbs,Used For Signal Lights, Trunk Lights, Dashboard Lights, Parking Lights, With Great Brightness and Longer Life(Pack of 10)-Red for this purpose and it worked out great.As others have recommended, if you have some electronics background and can configure the settings inside the house before installing it in the vehicle, it makes dealing with the setup that much easier rather than trying to do that on your car. See all verified purchase reviews (newest first) Most Recent Customer Reviews Excellent product, does exactly as described. Added it to the third brake light on my truck camper shell.I selected this one because of its versatility and its ability to handle both LED and legacy incandescent lights.