Notice the small candle lit on the altar. Msgr. Michael Schmitz, ICRSS, celebrating Mass in Stockholm, Sweden. Photo copyright Daniel Nygård.
Fr. Ronald Brown describes:
Being that the "Low Mass" is really a "cut down" version of the High Mass (which is more proper but not practical in most parishes) the one Sanctus candle remains. In some places a "sanctus candle" was lit on a wall bracket on each side of the altar, or on the floor.The Catholic Encyclopedia describes it accordingly:
The use of the sanctus candle is required by the rubrics and ignored by most...it is called the "sanctus" or "elevation" candle and lit prior to the Canon. The rubrics mandate the use of it.
"The rubrics of the "Roman Missal" direct that at the Sanctus, even of any private Mass, an additional candle should be lighted and should burn until after the Communion of the priest. This rubric however is much neglected in practice even in Rome itself." in this pic you see it at the Epistle side of the altar.