Thinking about a variety of spells that could be useful for lab personalization, or for a covenant at large. This one is about lighting.
Create a Candle (CrAn 30)
R:Touch, D:Moon, T:Ind
This spells creates a large, clear-burning wax candle. With an Ignem casting requisite, the candle is lit when it appears.
(Base 5, +1 Touch, +3 Moon, +1 treated animal product)
Intuitively, it feels like this should be much easier than that. I could drop the duraiton to Sun, but then the candle would disappear at sunset, which is not very useful if many of them are used to light your lab. One could make a case that this should use +2 magnitude for treated and processed animal product, but I felt this was excessive.
By comparison, directly creating a candlelight with the same duration is only level 10 (Base 2, +1 Touch, +3 Moon).
The effect could be enchanted into an item, which at first glance does not seem very cost-effective compared to a direct creation of light using Ignem. However, an Ignem-based item only affects the area where it is located, whereas the item would provide free candles that can be used on a much wider area. (Effect Level 30, +10 Unlimited uses, total level 40 for a cost of 4 pawns of vis as a lesser enchantment.)
Such an item should have the same effect as having a candlemaker at the covenant, providing a Cost Saving to Consumables of 4 pounds per year (as per Covenants p.67).