I suggest avoiding the use of series string incandescent lights BECAUSE many of those strings of lights mostly include a feature that somehow bypasses the bulb's filament when the filament fails open. That would place a much lower load resistance across the supply voltage source, which could cause an unwanted load on the power source, and lead to excessive current problems.

 

Thank you for all of your kind suggestions. Sourcing from a different country is of course difficult for me. While than can be my last resort, I wanted to use parts available at local online shops only. I wanted to keep the setup compact as much as I could. After being unable to find COB or ultra bright LED, I moved forward with a generic 5mm white LED. I made this-


The light is not very eye pleasing though. I need to hold it in my hand and focus on the book.


I am open to all suggestions regarding its improvement in both electrical and mechanical term. I'd like to 3D print an enclosure with a flexible body if possible.