If you have looked at the availability of rolls of red and near infrared LED lights, you will see that there is a bewildering array, between orangey-red (630nm) to out of the visible spectrum so that you can't see it at all (940nm).

It's wonderful to hear from people making their own light hats. Keep them coming, and please send me photos to post on the blog. I love the creativity people bring to it.

With all the media attention on red and near infrared lights, let's celebrate the people who meticulously documented the effects of red and near infrared light.

Ron is an electronics engineer and he the genius behind this astonishing design.

Sarah Abbott, ABC Northern Tasmania reporter, spoke with Max Burr and me about the Tasmanian red light adventure.

Look at the instructions for DIY light hat devices, and the photos of both devices, and you'll see that Eliza is all enclosed, with a few holes at the top, and is lined with reflective foil, whereas Cossack is very open, lots of ventilation, no reflective foil.

This ABC story is generating interest in red lights and Parkinson's disease.

Three years ago, I would have said that if you have had PD for a long time, then using a red light hat may help a bit. That comment was based on two things…