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I think the drls are normally dimmer in the daytime and brighter at night. This kit makes it 100% brightness all the time. Looks like a worthy mod.
DRLs are brighter in the day and dimmer at night. The DRLs at night, if they were to be run at full brightness like they do in the day, are completely obnoxious and blinding to other drivers.
So here’s the catch why Japan has these. Their DRL during the day isn’t at max brightness because of Japan’s restriction, so this makes it max brightness without modding their headlights.