Roy
The 2030 Lux that Charlie measured was with a module that had a DB700 in it.
1040 FC(11190 Lux!!!!!) with a DB400 seems a teenie bit high.
After reading the specs on your adapter there is a conversion of .1mV/Fc on the 200-2000 Fc range not 1mV/Fc. That would make your reading 104 Fc(1119...