DRL BULBS

[MAC]

My Hummer came with 3157 DRL bulbs and I have used 3157 replacements.

4157, I was told is an extra version, in power output or life, I have also read here long ago that someone used 4157 and burned the fuse or wires. May not be worth the risk to try that.
My cheap 3157s last 12-14 months, I think that is good value enough, to mess with 4157, you may end up with some mess.

In DRL, the light is just for look, not to see but to be seen. Among the H2s I have seen coming my way during daytime, all have the factory yellow DRL light. As they say: "THERE CAN ONLY BE ONE!"