Yeah the diffuser would probably hinder cooling in an aircooled application.
Here are some pictures of the projector lights in action.
![](http://i7.photobucket.com/albums/y256/equilibrio/IMG_9843_zpsrm9ly83k.jpg~original)
And LED tail lights
![](http://i7.photobucket.com/albums/y256/equilibrio/IMG_9845_zps6bcayxgd.jpg~original)
Coincidentally these fit perfectly in the elephant foot
![](http://i7.photobucket.com/albums/y256/equilibrio/ledtails_zpsqkvhyvca.jpg~original)
I used one of these for the so I can have stop/turn/running light.