The Theradome Laser Helmet is claimed by its manufacturers to promote healthy hair growth.
In this infographic, they claim it delivers energy to the skull at a concentration of 6.959 j/cm2 - presumably they are referring to 6.959 J/cm2.
This is consistent with the research I have done (e.g. this unreferenced essay) that suggests around 6 to 7 J/cm2 is required for better hair growth.
However, they also claim in the chart from this video segment that the concentration is:
There web-site states:
The key to treating hair loss is lasers, but all lasers are not created equal. We use specially developed, high efficiency lasers that allow us to deliver the maximum amount of light and cover 582 cm2 of the 720 cm2 total scalp area in the average human head. We don't want to bore you with numbers, but with over 440 Joules per treatment and an optimised wavelength of 678 +/-8nm, each of the 80 lasers is precisely tailored for maximum hair growth.
Each treatment is 20 minutes long.
I have attempted to do the calculations to support the 6.959 J/cm2 claim, but have been unable to get these results.
Is there evidence (or even a calculation with the given data) that supports either of the concentration claims?
This question is re-posted from Physics.SE, as suggested by @BrandonEnright