Most of the kits also have an option for standard operation.
I've tried most all of the replacement LED 1156/57 bulbs with poor results. The problem is that the replacements don't have the even lighting that a standard bulb has. Even the side firing types leave much of the lens dim. Many of the rearward firing LED's are so close to the lens that there is a dark horizon line that effectively reduces the amount of light, plus it looks weird.
The dedicated kits with a large at panel filled with rearward firing LED's give the brightest and best coverage. They are much brighter than the stock arrangement.
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