3157 ZEVO LED Red Bulb - Bright LED Bulb, Ideal for Stop and Tail Lights (Contains 2 Bulbs)

This problem with most aftermarket LED replacement bulbs is that their various designs do not emit light as efficiently as the old incandescent bulbs do. Despite what manufacturers will tell you, they are a poor mismatch with the various internal projection geometries of any given vehicle taillight. For bright light to emit efficiently, the reflector or Fresnel lens type taillights of any given vehicle have an important relationship with the bulb and must focus properly. An incandescent lamp emits light in all directions from the central filament point of the lamp. The aftermarket LED products typically emit light mostly from the broader sides of the barrel of the lamp assembly. Therein lies the issue. The LED light source cannot focus properly towards the other elements of the taillight assembly and out the rear of the vehicle. Having seen the poor visibility results of improper LED bulb choices on other's cars, I looked for a few hours to find a lamp that would work properly with my Chevrolet Tahoe tailights (internal rear reflector surrounding the bulb socket). Enter the SYLVANIA - 3157 ZEVO LED Red Bulb. Like an incandescent, it emits light from two super bright LED elements at a central focus point and towards the rear reflector surrounding the lamp socket (a common arrangement in many vehicles). Light is efficiently and brightly emitted out the lens (much brighter than the incandescent). It works perfectly on this type of taillight. Now the caveat. This particular lamp may NOT work well with the integrated fluted Fresnel lens elements on other cover assemblies. It's LEDs focus light only around and towards its socket base. However, IF there is a reflective surface there, than this lamp should work projecting the light onward through the Fresnel lens. Getting the right lamp that works well with your taillight assembly an important visibility and safety factor too.

Blinking Speed was “hyper flashing” until I disabled ‘bulb out warning’ in a tool known as ForScan for my Taurus (google it). The value for the money is excellent because they are bright, use less power, and activate faster. The lights are also used for my brake lights and work perfectly. Fit and installation was perfect! A simple drop in replacement for my use. I highly recommend these to anybody who knows they will work. Simply activating faster than a normal bulb is a safety issue and can prevent an accident. If you are unable to disable your “bulb out warning” or have hyper flash issues you may need the Sylvania resistor. Else look for a CANBUS safe LED.

SYLVANIA - 3157 ZEVO LED Red Bulb: This bulb is lower wattage (1.5/0.4W) than the white version (1.7/0.7W) on both segments (high and low power 3157 'filaments'/LEDs). If used as a single filament 3156 bulb you get the bright filament/LED, the low wattage 'filament' is unused. LED facts: This one uses RED LEDs so most of the light passes through the red plastic lens that normal/OEM cars use for break/stop/running. I tried the white ZEVO LED bulb version behind the same lens and IT IS DIMMER even though it is higher wattage. THIS IS CORRECT. The white LEDs emit a low percentage of light in the red spectrum so most of the white LED light is absorbed which makes for a dimmer light after passing through a red lens. Most of the red LEDs light (high percentage) passes through a red lens. An issue, there are two sides to this LED and a large center heatsink. This makes for a no-light center spot. Since the light is so bright this is a minor issue (for me). Regular bulbs have a ceter bright/hot spot so this LED design is the opposite. Also, since the LED is two sided they will emit most light either up/down or left/right. In my 1997-2000 Caravan design tail lights I get both up/down and left/right. This is not a big issue since the lenses are a good design and the light both bounces around well and is captured by the Fresnel lens facets and reemitted in a good pattern. Matter of fact the lenses emit is a nice full bright glow instead of having the usual hot spot in the center. Different but nice. Remember, if used for the turn signal light you'll have the usual fast blink issue. You'll have to install a 6/4/3 ohm resistor to stop the fast blink.

Liked

Liked it very much. The running light does not make that difference, but for signal and brake light it is quite brilliant. Installed in a Triglide Ultra 2023.

I ordered these for the tail and brake lights on my 1997 GmC yukon GT. The bulbs are definitely brighter and a deeper red than the clear halogen bulbs they are replacing. They do however cause hyper flashing of the turn signals. Just order the tomall 4 pin EP29 led flasher unit when you order the bulbs and the hyperflashing shouldnt be a problem. The flasher unit is located under the dash next to your e brake. If you have trouble finding it, just activate your turn signal and listen for the tick tick tick, then touch the flasher unit.. you will feel it working. Remove the old unit and plug in the new led unit. Done! Its that easy.

They do not illuminate all around the tip, so they are useless and dangerous when used in a Jeep Wrangler OEM rear light fixture because they do not illuminate properly towards the back of the jeep. I did not installed them and I'm very disappointed in Sylvania for this very poor design choice. Not worth the price.

Easy to install. LED is very bright. Would recommend this product.