These leds from Tamiya are very bright !
It's just plug and play, you don't need to mod it or something.
You can place them in the lightbuckets, if you have Tamiya lightbuckets, they come with some kind of a U-thing, you place the led into the lightbucket, put the U-thing on it, and tight it with the screws.
I bought this one for my Tamiya RX7 body, I have now al leds on it and it looks very cool !
I drifted with some friends at a parking lot, and they wanted a lightkit too, haha.