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What are the units that cinematographers use to describe the power of a reflector or a diffuser?

I was watching the VSCO Academy’s video with some advice on doing food photography with a phone, and one of the tips was to use anything white as a reflector and fill the shadows with that bounced light. Could this really be effective? The advice does pop up in a few other places, for example, here: http://iphonephotographyschool.com/food/

Hey all, I'm coming up on a project where I'm dealing with a lighting challenge and the project is ultra-low budget for a non-profit, so I don't have a big team to drawn on. We're shooting a group of individuals together in the middle of a field near sunset. My vision for the shot and the way the location works best is to put the setting sun behind and slightly off to the side of the talent and fill them in with bounce. I'd love to have a few HMIs out there to fill, but the location is too remote, and doesn't really work for big lights and a generator. I've done this plenty of times when it's just a medium shot or MCU of a single person and you can get a white bounce in nice and close. That's no problem, but for this shot it's a group, I need to fill a larger area and the reflectors would need to be further back. Is there a formula or rule of thumb to estimate how large a reflector surface I'll need to provide a certain number of stops of fill? I need to know if a couple of 8x8s will do it, or will I need more and bigger, or if it just isn't possible and I'll need to scrap or re-imagine the shot. Any thoughts would be appreciated.

Reflector holder & glass reflector for Studio 5000 Theatre, Compact 4000, Studio 2000, ... (can be used as retrofit kit for old glass reflector versions) -EBAY LINK: http://www.ebay.co.uk/itm/-/321919867922?

Looking for a buyer who shoots stills as well as motion and would rather own then rent a dual purpose Briese. I'm selling my Briese Focus.2 100. The Focus.2 100 is brand new and comes with motion and still setup. For motion, an older Briese 2.5K daylight HMI with just over 1,000 hours on head/ballast (works great). For stills, brand new, factory direct Briese strobe head fitted for Broncolor packs with a like new Broncolor Scoro S 3200 RFS Power Pack. All additional tubes/accessories/adapters needed for the Focus.2 100 to go between still and motion as well as 1/4 and 3/4 diffusion. The Focus 100 travel bag is included as well as an older, non-focus, square 100 reflector which is the only item that needs some tlc. Asking $28,000 ($40,000 if purchased separately - the Scoro alone is $14,000). I’m really interested in selling the whole kit (not breaking it up). So either the dual purpose fits your business model or you know someone who can appreciate the amazing features of the Broncolor Scoro S. If interested, message me and I’ll send photos (or video) of all the items. Again, the focus reflector is brand new, the Scoro is like new (6 jobs shot on it), and the only item with age, the Briese HMI ballast and head, has just over 1000 hours. Thank you. Mark