It turns out that the gallery and probably the whole college have special regulations to follow about open flames. Candles and incense are OK as long as a monitor is in attendance. This meant that candles couldn't be left buring for the whole show and that people couldn't just wander in and light a candle or a stick of incense whenever they felt like it.
The scheme I evolved to deal with this problem was called 'Candles and Incense' hour. Each evening after the show from Monday I would be in attendance at the gallery from 7:00pm to 8:00pm [just before the gallery closes] on Monday to Thursday. Candles and incense could be lit at this time. The rest of the time the brightness of the lights would be adjusted upwards to compensate for the missing candlelight.
Although the gallery ambience was more authentic [old church-like] in candlelight it was still quite good in the yellowish dimmed spotlights.
I also enjoyed the additional chance to appear as Brother Dominic and invite people to light candles and incense and chat about spiritual or artistic matters. Interestingly, most of the time people preferred to treat me as an artist. and I didn't have the gall to resist on these occasions. My daughter Carol also joined me as an acolyte on Holy Thursday and Hassan took more video footage.