Honeywell 4820HDHM User Manual page 171

L - LED State
Determines if the LEDs should be on or off, and when. Ambient illumination
(0L) is preferred for taking pictures of color documents, such as ID cards,
especially when the imager is in a stand. LED illumination (1L) is preferred
when the imager is handheld. LED State is not available when using Decoding
Style (0P).
LEDs off (default)
0L
1L LEDs on
E - Exposure
Exposure is used in Manual Style only (2P), and allows you to set the exposure
time. This is similar to setting a shutter speed on a camera. The exposure
time determines how long the imager takes to record an image. On a bright
day, exposure times can be very short because plenty of light is available to
help record an image. At nighttime, exposure time can increase dramatically
due to the near absence of light. Units are 127 microseconds. (Default =
7874)
n E Range: 1 - 7874
Example of Exposure at 7874E with
fluorescent lighting:
Example of Exposure at 100E with
fluorescent lighting:
8 - 3