Posted by Lamont in NC on February 03, 2019 at 18:05:37 from (45.36.228.199):
Follow up on my request for folks experiences.
I bought a pair of Sylvania Zevo 3157 bulbs to put in the daytime running lights on my 2001 GMC Sierra. Sylvania is a well know name and they seem to think highly of their Zevo bulbs. I put one in the passenger side first leaving the incandescent in the drivers side and then put the truck in gear and went out 40 feet or so and looked at the front of the truck. Frankly I was not impressed. I could see the drivers side light was on in the bright afternoon sun but the passenger side DRL just looked like part of the chrome grill shining in the sun. The incandescent being yellowish stook out while the zevo being 6000 kelvin just blended in. I'm not sure if that's what I want from as safety aspect but I guess if the truck was in a shadow it would be visible. Next, to judge light output I then tried after dark--I had to trick the ambient light sensor with a flashlight to get them to come on after dark. The Zevo appeared IMHO to be not quite as bright as the incandescent--certainly no brighter. I went ahead and put the other one in and I'll live with them a bit as they surely run cooler and those housings are beginning to look bad. Still I'd hoped for better.
I did do a bit of research and found one trick that helps a little. As you probably know in 2 filament bulbs like the 3157, and 4114 one is for bright use (brakes/turn lights) and the other for dim use (tail/marker lights). The Zevo actually has a bright and a dim led on it and in DRL and reverse light applications only the bright one is used. But by moving the pin from the dim filament over to overlap the bright pin you can make them both come on at the same time in these single filament applications. It adds a bit of light though not really that noticeable. For example how much brighter does your brake lights look when you also have the tail lights on vs when you don't?--not much but as both filaments are on it has to be a bit brighter. I went ahead and did this to the Zevos I put in the DRLs to make up for my perceiving them to be not as bright as the old incandescent bulbs--can't hurt. I then did this to the incandescent bulbs in my reverse lights--again, it can't hurt and I can always use more light.
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