Translation:My girlfriend loves when we have candles.
There isn't a direct equivalent for candles in Danish. Normally people would use 'stearinlys' or just 'et lys' even if they were made of wax, and then say 'ægte stearinlys' if they wanted to stress that they were in fact made of stearin. You can also say 'vokslys' (wax) or 'tællelys' (tallow).
The term 'levende lys' is the antonym for 'elektrisk lys', but would also cover oil lamps etc.