I bought these LED's because a TT-01E comes with an TLU-01 with 4 LED's (2 whit and 2 red), so they don't fill the lightbuckets.
These LED's are very bright and are only red of color.
Not like those cheap-ass LED's that are painted red so it only looks like red (but they are orange/red when they're on).
The Tamiya one's are nicely red.
These LED's fits perfectly in the slots of the TLU-01 unit.