I have a 2018 Chevy Colorado and my first set of HIKARI LED bulbs were HIKARI Ultra LED bulbs in 2019. The difference from the factory was day and night. Sorry for the pun. I can't believe GM put in such a dim and almost amber lightbulb. They make night driving a pleasure. I decided to update and try the new 2021 version, HIKARI 2021 Acme-X, to see if there are any improvements. However, aside from the fan/heatsink size, I don't see much of a difference. The light output seems to be the same. The 2021 version also does not have a separate power module. However, the overall size is slightly larger, and due to the larger size, the dust cover is not attached again. I had to adapt the GM dust/waterproof cases to the HIKARI 2021 Acme-X H11. I then used a heat gun to heat and stretch the back of the case to match the new heatsink design.
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