Please see the HDF format, quality flag and data caveats information in:
https://cdaweb.gsfc.nasa.gov/pub/data/dmsp/documents/ssies/

The HDF and Plot file names were changed from the originals provided by University of Texas @ Dallas.  
File name change examples: 
DMSP plot file f16_rl123662115_v2.jpg  was changed to dmsp-f16_ssies_3-rl_20123662115_v2.jpg
DMSP HDF file rl120010104_v2.f16 was changed to dmsp-f16_ssies_3-rl_20120010104_v2.hdf 

The SPDF has also made cdf files from the hdfs, so the same data is available via the CDAWeb system.

TJK February 3, 2022