Testing my new light equipment

So I recently got my new light equipment from USA, on wednesday, was testing at night aswell, and it lights all good, and today I tested during day time, and it works allright to me!!! I'm very happy.

I still got ALLOT to learn, I feel like an ass who dont know nothing when shooting with the flashes haha... gotta experiment more.

The light equipment is

3 x Vivitar 285HV

3 x stands

3 x receivers + 1 transmitter (radio transmitters)

so it's all cordless and all, and working just fine, BUT they seem to flash out some times when I havnt even pressed the shutter, I guess there's some radio waves disturbing or something!? it doesnt make me any harm tho, for those cheap Chinese radio transmitters thats just fine with me...

anyways here's the result, so in future I will hopefully use them more and more.

These shots were shot with the flashes directly on the car, not bouncing in umbrellas and such, but I'm considering getting umbrellas tho, whats the possitive about them and whats the negative? any good strobist can tell me?