Як зробити самому Valkee (гаджет для лікування сезонної депресії)?

Hi all, I just make very similar product to Valkee, it took me less than 2 h and I spent about 10 USD.

http://biostevie.cz/pirat.jpg

Before I made it I checked carefully what technical data are available to be sure that have good copy:

1. Luminou flux for valkee is 6 lumens, it means they do not use any optical fibers but standard 5 mm White LED (typical white LED has nominal currnet about 25 mA, at 3,2 v, this gives total power of 80mW, typical efficiency for this type od LED's is about 90 lm / W so total optical flux of mine earphone is 0,08 * 90 = 7,2lm (Valkee declare they have 6 lm, so it seems they run LED's at current about 20 mA.
2. I used the cheapest earphones, where I removed mini speaker, drilled it inside and I use 5mm led's. So this LD was too big to fit in earphones so I cut external part of LED to reduce diameter to about 4mm.

Then I glued LED to the earphones, copnnected both LED is series and I use simple 30mA LED driver with 2 AA ni-MH batteries.

In my opinion it is very comfortable and do exactly the same jub as Valkee,

In anybody is wish to use it but do not want to pay aor can not afford buing valkee will be glad to help with making it.

I am from Poland where we have now very short day and right now I am testing me device.

PS current consupmpion from 2 AA batteries in 80 mA, so I expect about 15 h of continuos working.