Best On-Camera portable LED to attach to my Arri SR?

[Guy Kozak]

Hi!

I'm curious if anyone has any recommendations for a portable light that I can mount to my Arri SR for on-the-go lighting. I am filming a wedding in a couple weeks on 16mm and thought it would be fun to have a rig like this for some night footage on the dancefloor. 

I am used to taping flashlights to the top of my camera (see attached photo) which has given me some great looks but I need to look like a professional this time around. Looking for something powerful, ideally with a rechargeable battery pack and long battery life!

Please advise. Thanks so much!

Guy

[Guy Kozak]

I forgot to mention– I bought a ROTOLIGHT 2 for this purpose but it seems to have arrived busted (the battery springs are all compressed funky.) It felt pretty cheap and flimsy out of the box, so before I return it for another one I'd love to know if anyone knows of something better. Thanks!

[Jay Young]

I constantly use either a Quasar 6", or an Aputure MC depending on the matte box.