The book lights give limited light and I find they dim very fast. I have the
LED light for the machine and it gives a true bright light and has 100000 light hours. Most inexpensive book lights have 40 light hours. The book lights that have high light hours with bright light will be around $30. So to me the machine led light is not over priced for the value it gives. Just my opinion.
Here is some info I found:
100,000 (or whatever light hour your bulb is) hour-lifetime means that you have that many hours till the bulb is at 70 percent of its original brightness. Seventy percent, research shows, is the point where people say, “Hey, I think the light is less bright than it used to be”