Sometimes two lights are on. Sometimes only one light. TenThe lamp is a brand. One model. Bought together. One of the flash devices is connected.It used all the time. It's ok. Just recently.
One possibility is that the output power of the two lights is different, so the speed of the call is not the same, you put the flash plug on the output of the big lights can be solvedAnother possibility is that the shooting environment is too bright and can cause photosensitivity and lightning failure
Supplement:So, may be a photosensitive receiver of the flash studio has failed.You switch the receiver to another light that is not always triggered.Let the other light lead.Like you I have encountered, I now have a lamp I posted a mark, the only light can not be light, too lazy to repair, so every time I will flash this with lights on, let it go to other light lamps.And I think it's OK. If that happens again, I'll plug in another flash device (I have two sets of lead shots).If you do not want to join, and of course, or to repair the good.
The conditions are too limited.I suspect the two lights are calling back at different speeds.Are these two lights of the same brand?Do you have the same set of output functions when shooting?Are the two lights flashing the same way? Do you plug in the flash receiver or just one of them, and the other is led by light?
