Hey, these ideas are free! You didn't steal anything 
Looks pretty cool. Except you put both rows of "letters" in the slots. For the bike-light idea, you just use one row and leave the top slot blank. I provided both lins of letters for those who wanted a choice between full letters or the partial letters.
You can probably just move the transparency down a centimeter or so.
Oh, and I just noticed it's upside down. The "H" should be first.