Question

Why does kindle 5999 does nt have back light?

Answer 1

Kindles with their e-ink technology ensure that the ambient illumination level and kindle brightness level has no variation, which impose no further strain to eyes.It is always healthier to use devices with no back-lit screen and use the already existing natural / artificial illumination.

Answer 2

ANSWER
........
BECAUSE WHEN THIS DEVICES ARE MADE THIS COMPANY DOES NOT HAVE BACKSIDE LIGHT.
AT THAT THERE IS A SHORTAGE OF GAS ARGON