Bubble on the laser heads facing In or Out?

[Lenin]

Maybe I don't know how to search or what terms to use but could not find an answer. Looking at some of the ALP install pictures I see that sometimes the bubble on the heads is facing inwards and sometimes it is facing outwards. Does it matter? From what I remeber on LIs, the bubbles had to be on the outside.

[busta]

Depends on position on car , most times bubbles out but if heads mounted extremely wide then may need to put bubbles in.

[hussein]

Out

[Mirage]

Due to the extreme sensitivity of the ALP heads this is no longer an issue. It was more important on older systems with longer heads. Not a critical factor with ALP although we still tend to give the same advise as @busta

[Yellowcab]

I feel that as most vehicles taper back as you go laterally. With laser jammer heads having a receive (bubble) end and transmit end, I prefer that the bubble be more exposed than the transmit end.