When I enter Earl Douglas Haig Light, Durban, South Africa residence, familysearch.org shows "No records found for > Name: Earl Douglas Haig Light, Event: Residence, Place:Durban, South Africa."
There is a Douglas Haig Light who married Phyllis Pringle Hall in Durban, Natal, South Africa in 1940. Could that be the same one?
Another marriage of a Douglas Haig Light to Sheila Elaine Shepherd in 1944 in Durban.
Those are the only two mentions I have found for a Earl Douglas Haig Light. You might try researching one of the wives to see if there is more information or to find out if that is the one you want.
There are several Michael Douglas Lights listed, one listing Lisa Michelle Light as a possible relative:
Most sites do not give details about living people.