Newest model NightReader now in Bangui/CAR

Willem, since yesterdy again in Bangui for aircraft maintenance took with him from here six NightReaders. I want more people to get user experience, also an expectation that this little device should become more widely available. The first user comments will come back in one or two weeks. I am ready to give follow up to that with improving on the present design.
The present latest model uses only one LED, using 10 mA, 2.5 V because it emits yellow light. the diffusion angle, meaning the width of the ligt beam is wide, 70 degrees. The cost about 20 Euro cents if bought in some quantity.
These NightReaders are constructed as if done with local aids, apart from the electronic components: wood for the handle, roof sheet for the shade wiring from a scrapped car. The little pincer made out of a bicycle wheel spoke proves to be very usefull for making the tiny holes.
Keeping components on one side of the thin wooden circuit board and soldering on the opposite site works well. Cross over interconnections are made by bit of insolated wiring placed over the electronic parts. I look for smarter circuits. Jos Knoop researches on a more appropriate tyristor, Marc came up with a source for relevant info at the website "Circuits on Line"(see forum page NightReader). I will do some testing myself to get an idea how long the NightREader takes to drain the energy out of used batteries with a to low voltage for practical use.