Long ago when I saw the first version of PistenBully 600 [1, 2] by Freggel, I was amazed with the model itself but specially with his custom rotating light beacons.
Was wondering how did he made them, but didn't took much time investigating what it might be.
More recently there has been a discussion at EuroBricks around a beacon prototype made by a Russian AFOL, but without much useful details disclosed, that would help to reproduce the effect.
Fortunately yesterday Freggel published one video where he discloses the secret behind the rotating LED beacons in his PistenBully.
Based on the hints given I found these are made with a small component sold by www.pistenking.com, a webshop specialized in selling accessories for scale groomers.
Here he uses the 1:16 rotating LED beacon, and there are also other scales (1:12 and 1:8) available.
Although the unit prices are really steep - 38,50€ for a single unit, and 35,00€ if you buy 3 or more. Eventually worthwhile if you want to make a MOC of your really unique.
In the sequence of my investigation also found this is a new beacon version. It seems that all started with a Freggel own design, as seen in the documentation available from his website [3, 4, 5].
Please avoid sending requests to post specific models on this TBs section.
We understand some of you would enjoy to see your creations featured here, but please understand that because only one video gets highlighted per week, it is impossible to accommodate all the great MOCs continuously build by the Technic builders out there. They simply won't fit all and that's also not the purpose of this blog (see the header statement).
Many of your MOCs are scanned anyway and listed for later publication when they do not fit immediately. However some remain in the backlog queue just for too long and eventually loose the relevance or the publication opportunity window. As a rule of thumb, we also avoid publishing MOCs that have been featured by their authors or other fans at some other great web places dedicated to the Technic community out there. It doesn't mean that occasionally some won't get published here anyway.
Thanks for your understanding!