i have spent two weeks now testing with a cheap but powerful 650/880 array from
amazon that costs $69. i can attest to the effects - it is awesome at calming and improving sleep when applied to the forehead.
the device i got is "36 High Power 880nm NIR Near Infrared LED's (Non Visible) for Deep Penetration, and 13- 640-650nm RED LED's (Visible)" in a small square grid array surrounded by foam.
the maker claims penetration approximately 4" to 9". a reviewer wrote: "I wrote the company, and they are very responsive, saying the total power is 1.5 joules/cm2/minute. This is typical for a device like this (more powerful devices use led lasers and are pulsed - also much more expensive) If you use it for 15 minutes, you are getting a total of over 20 joules/cm2.".
this is somewhat comparable to the power delivered for vielight (which ranges a bit depending on the product and study and is specified in the methods sections of the research studies that use the vielight).
so, i'm all in. i want a vielight, and i want both alpha and gamma, but ouch, the price is seriously high. there is an october sale - 10% off, does anyone know if this sale is normally running?
Edit:
i was inspired by an interview of dr hamblin by mercola where hamblin pointed out that there are very powerful LED flood lights that could cheaply be used (if properly EMF shielded). i found another potential test product, this one an 850 nm flashlight for hunters but i do not know if it properly shielded or if the power is just too insanely high:
UniqueFire T38 IR 850nm LED Night Vision Torch 3 Modes T20 Zoomable Flashlight Memory Function (3 Watts, 38 mm aspherical lense)
i worked out these calculations but i'm not an expert and they could be wrong. it looks like this is an insanely powerful device - the output (264.6) is many times that of vielight 810 nasal (10.56):
Wavelength: 850 nm
Beam spot size: 3.8 cm
Area of spot: 11.34 cm2
Power output, mW: 3000 mW
Power density per LED, mW/cm2: 3000 mW / 11.34 cm2 = 264.6
it seems like this might be a good device to penetrate to deep parts of the body or brain - but care must be taken with the power output. in fact, i deleted the link as i think it's too over-powered and could result in a weird kind of burn.
i was thinking i might actually just make one:
https://www.instructables.com/id/810nm-10Hz-LED-Pulsing-Flashlight/
but i looked into the details and it's dodgy. the author is trying to drive a 100mA led from a device that can't put out more than 51mA. he gets it to work but it's not really running at capacity. it looks like making one via raspberry pi or arduino is a bit more complicated due to the fact that these can't sufficiently power the LED.
so, after researching it, i ended up buying the alpha/gamma vielight neuro.