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I have a Flashpoint Rovelight 600 monolight. I would like to take it to the beach for engagement photos and wedding photos.
The only problem is that it is a little bit top heavy. The battery is in the head unit itself.
I would like to use the light on a manfrotto light stand and a medium size softbox.

I am just wondering what size of sandbag do I need? What is your recommendation? We often shoot engagement sessions ans wedding portrait sessions on the beach. Wind is an issue.

Is it possible for you to have an assistant hold down the lightstand? That's a better guarantee than using a sandbag to weigh the stand down. The other plus is you're not going to be lugging around the 10lb bag just to weigh down the stand.