If you want to get details about auto bulb 3057 vs 3157, please see my letter as below.

If auto bulb 3057 and 3157 are halogen bulbs, they are litter bit different.

The watts of auto bulb 3057 is litter bit smaller than 3157 auto bulb.

If 3057 and 3157 auto bulb are all led type, their watts are all the same.

When you buy led type, 3057 and 3157 auto bulb are all same using.

In order to make you clearly auto bulb 3057 vs 3157, I will show you picture as below.

If you would like to get detail watts of 3057 and 3157 auto bulb, I will show you by another email.