From a reader:
Our TLM Chaplain has been severely reproached by his brother priests and parishioners for removing the spotlight/bulb that shines directly through the Blessed Sacrament in a Monstrance (in the context of an Adoration Chapel).
I remember reading somewhere that shinning light through the Blessed Sacrament to "illuminate" it is strictly forbidden. I see no reason why spotlights can’t be directed at the monstrance, but is there a real need to make the Blessed Sacrament ‘glow’?
This practice is prevalent in Asia and parts of Australia. I don’t believe it is neccessary to expose the Eucharistic Lord to a constant 70 degree celsius 24/7. Could you, or at least someone, provide some evidence (or Church documents) to show that this practice is not encouraged by the Church?
You are right about the illumination. The Host is not to be back-lit. Look in the Fortescue-O’Connell (for the 1962 edition of the Missal, etc., for the traditional form of Exposition during Forty Hours Devotion, p. 333) you read:
No light may be placed behind the monstrance, so as to shine through the Sanctissimum.
And in the accompanying footnote, which also cites the various old decrees of the SRC, …
Electric light is forbidden on the altar or within the throne of exposition.
That might help.