Instructables
Blue light therapy can be used to improve mood, improve sleep, treat jet lag, adjust bedtimes and boost energy. It is done by viewing it with your upper peripheral vision. I think this light book would benefit students who start school early when it's still dark. This one can fit in your backpack, is dimmable, has an adjustable timer and it doesn't cost too much to build. Using it in the morning can turn you into an early bird and using it in the evening can turn you into a night owl. You can use this while riding a bus.

Features
AC or Li-ion battery powered
Wide range of input voltage: 8.4-24V
200 LEDs
Wide viewing angle
Power consumption: 14W
Battery life at full brightness: 1h 30min (using two 18650 2.5Ah batteries)
Brightness range: 256 levels
Diffused screen
 
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Step 1: Materials

Picture of Materials
1 - hollowed out book with 8 x 6-1/4 x 1/8 of storage space
1 - clear plastic sheet larger than 8 x 6-1/4 x 1/8 with invisible tape
1 - 4 x 8 copper cladded board
1 - 3 x 1-1/4 copper cladded board
2 - 100nF capacitors
1 - 12-20V zener diode
1 - 1N4001 diode
200 - 0805 wide angle 470nm blue LEDs (120-130 degrees)
1 - IRFZ44N MOSFET
1 - AO3400 MOSFET
2 - 10M resistors
1 - 33k resistor
1 - 1k resistor
1 - 10k resistor
20 - 100R resistors
1 - on-off switch
1 - LM7805 regulator
1 - ATtiny85
1 - 8-pin DIP chip holder
1 - arduino (you only need this to program the ATTiny85)
1 - LM2577 DC-DC converter boost module   
2 - 10k potentiometers
1 - DC power jack
1 - 9-24V power supply (18W or higher)
1 - 2 cell 18650 holder for protected cells (protected cells are slightly longer than unprotected ones)
2 - protected 18650 Li-ion batteries
1 - 3A slow blowing fuse (if using unprotected batteries)
4 - sets of stand-offs (1/8" think)
4 - sets of nuts and bolts (1/8" thick)

*all resistors and capacitors have 0805 packages
DrFro1 year ago
For those of us who are not so technically inclined, a desktop fluorescent fixture with a 6200 Kelvin tube ( purchased separately and installed by you) can achieve the same effects. I'm not sure if LED's will do the job. Albeit not portable ,I know of several people in office jobs who have noticed positive results.
A very good Instructable indeed!
n-2-stuff DrFro11 months ago
I totally agree. I have many 6500k fluorescent bulbs (some are 6000k) and they are better for reading and working on projects than 4100k lamps any time.
I have SAD (Seasonal Affective Disorder) and already own a SAD light, I researched into it and learned that light is measured in 'lux' and that for a SAD light to work it needs to emit at least 2,500 lux, although most light boxes are now 10,000 lux as the brighter the light the less time you need to sit looking at it.

I'd be interested to know if this project emits enough lux, as a number of the top brand products in the shops don't actually emit enough. They are designed more to aid natural waking, by replicating dawn light - which may help some people, but doesn't really address the issue of SAD at all.
hanlin_y (author)  kitschkittyuk1 year ago
Lux is lumens per square meter and takes into account how sensitive our cone cells are to the light but not the number of photons. To treat SAD, the light needs to stimulate the ipRGC cells in the retina which peak around 470nm. For blue light, it is better to use watts per square meter.
gpavlovsky1 year ago
Nice job, a bit overkill on some parts.
My therapy for SAD was moving to Thailand. Perhaps I should post an instructable :)
schmitta1 year ago
Using a computer is overkill for timing and light dimming. Use 555 for 1/2 hour timing. and I could probably design you a circuit for light dimming if needed.
hanlin_y (author)  schmitta1 year ago
That would work too. You may need a frequency divider with a 555 timer because the 555 timer isn't accurate at such a low frequency.
Billrose1 year ago
Hello there,

As I suffer from S.A.D.ness over the dark winter I am very impressed with this idea.
However, can I ask... Does the Leds actually produce the correct spectrum of light required to provide treatment for S.A.D. (Seasonal Adjusted Disorder)
hanlin_y (author)  Billrose1 year ago
470nm LEDs are also used for SAD. The SMD LEDs used here were 467-470 nm.
According to the Mayo clinic there isn't as much research supporting blue light therapy while there is much to support white light therapy. Blue light also my pose a greater risk for harming your eyes than white light. Blue has a shorter wavelength much closer to UV and likely contains a lot of UV light. Light boxes for SAD should have as little UV as possible, a UV filter could help with this. White light is probably the best way to go, but I imagine this project might be improved by using white LEDs, but keep in mind that the research done with light boxes is based on florescent and incandescent light. It also might be important to note that white LEDs emit both blue and yellow light, which sort of cancel each other out to give the appearance of white light (much like the white pixels on your computer screen created by mixing red and green with blue light.) This may not be enough for our brain to receive the full benefit of the light or to counter act the possible negatives of the blue light. More research needs to be done on the effectiveness of LED light boxes on SAD.
When evaluating brightness, remember that your eyes scale brightness logarithmically i.e. the eyes don't perceive a change from 100 lux/lumens/unit-whatever to 1000 as being 10 times brighter but just roughly twice as bright. The speed of the change influences your perception of the change in brightness as well owing to both the motion of the pupil and some neurological controls.
schmitta1 year ago
Using a computer is overkill for timing and light dimming. Use 555 for 1/2 hour timing. and I could probably design you a circuit for light dimming if needed.
Your instructable looks excellent and your idea is good but I'm sorry to tell you it  will do little to help someone with true SAD, though it will likely help those who have to get up while it's still dark in adjusting their wake-sleep cycle.

As ChuckMeIntoHell wrote, research on the effects of light on SAD strongly indicate its not so much the wavelength of light (the colour) as the intensity. The time and intensity of light needed to effect any change for the better would quite possibly damage a person's eyes.

Speaking from personal experience of someone with SAD, I definitely need an intensity of 10,000 LUX for at least 45 minutes to feel better though many only need 20-30 minutes of bright light per day. 

Though 10,000 LUX may seem brighter than needed, it's the equivalent of early morning light on a summer day. Perhaps knowing how bright the light is, it's not unreasonable to understand why 10,000 LUX is needed for about 30 minutes, and why your light wouldn't help someone with SAD.
razamatraz1 year ago
Interesting. I have a Phillips Go-Lite which is basically the expensive store bought version of this and seems to help keep me sane in the dark Canadian Winters . I was wondering if it could just be replaced with simple blue 5mm LEDs.

hanlin_y (author)  razamatraz1 year ago
You can use 5mm LEDs if you have perf boards.
Showing off some Ubuntu love, nice.
krisygirl1 year ago
haha..would absolutely love one of these, but sorry I lost you at "100nf capacitors"..:))
ffcabral1 year ago
Very interesting to make it inside a book for design and ambience purposes.