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hi guys, Reading at the issues experienced by others on some Inon Z240 type IV strobes, i was glad not to have experienced any problem with my 2 strobes bought in 2011. However during today's dive i noticed straight away that my left strobe wasn't producing as much light as the right one I trigger these strobes in manual mode both on same power, using Nauticam fiber optics, Nauticam housing on Nikon D500. I've done a number of tests after rincing the housing on dry land: -swapped the fiber optics, no change -changed the flash output settings, i.e. starting with both at EV-2 and then EV-4 -> my left strobe still was noticeably less powerful -and of course, i had made sure each time the pre-flash button was fully engaged To make sure i wasn't getting tricked by what i was shootting at, i just aimed my camera to a white wall, shot subsequently with left and then right flash, could clearly see the shift in the histograms/ This looks like my left strobe has just become overall less powerful, very strange! I had just changed batteries before that dive so i am wondering if it could explain the problem, but i do wait for the strobe's red ready light to turn on before i shoot. My question to the community: does anyone know what could be the cause of my issue? Any way to fix it myself? If it requires repair, does anyone have an idea of how long and how costly such a repair can be (i am in Sydney, Australia). thanks and merry Xmas to all! Nicolas