"Dean A. Scott" wrote in message
news:1129955559.683169c993309acafd366a831897c8a6@t eranews...

. . . Aviation strobes use
25 joule, double loop U-tubes, while nearly all auto units use a 4
joule horse-shoe U-tube. Obviously, the 25 joule/watt unit is 6
times brighter.

Dean............

I looked for the tube rating on the 90 watt, 4 strobe Whelan system
advertised at http://www.strobesnmore.com/, but didn't find such a spec.
This is the one I have on my plane. It seems to be as bright as the Whelen
aviation strobe in a friend's RV-4. I see Whelen also makes a 60 watt system
for emergency vehicles.

Are you sure about the 4 joule vs. 25 joule rating? The rating for the
individual strobes tubes I have is given as 32 watts each.

Rich S.