Как сделать самому Valkee (гаджет для лечения сезонной депрессии)?

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 don’t 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 .