This is our other handy clip on red reading light that is bright enough as a bedside night light. This USB red light has a 620nm wavelength. This means no stimulating blue light. 
 
As a gentle option for evening lighting, red light also is less glaring and helps to preserve night vision.
 
Three illumination settings 25%, 50% and 100% brightness at 1600k.
Strong rubber lined clip with 16cm flexible neck.
Rechargeable with USB C cable supplied. 
1000 mAh lithium ion battery.
Two hour charging lasts up to 36 hours on low setting.
Size is 40 x 75 x 285mm.
 
The red light is a 620nm wavelength.