Why not both? D:Meal and T:Meal!
Note that D:Meal effectively already exists!
You just need the Minor Virtue Performance Magic (TMRE p.29), using the Craft ability Cooking. You can then cast your magic with D:Performance (equivalent to D:Conc in level) and it lasts for as long as your delighted guests keep munching and you keep serving them food.
New spell:glowing nose:effect: your nose glows with the wattage of a 40 watt lightbulb!
Duration:sun
Target:self
Range:touch
Creo Ignem, needs a new description (how many candles in 40W?)
A 40 watt bulb produces approximately 30 candelas (SI unit). A common wax candle emits light with a luminous intensity of roughly one candela, so 30 candles.
I'd say this is a CrIg Level 10 spell.
In particular, the Base Guideline is probably 3: roughly torchlight, certainly more than candlelight (Base 2) and significantly less than sunlight on a cloudy day (Base 4). While the Range is Touch, and the Duration is Sun, the Target is Individual, as it's an Individual light. So the final Level is 10 (Base 3, +1 Touch, +2 Sun).
Essentially Lamp without Flame (ArM5 p.140) with longer Duration and weaker light intensity.
They would obviously not synchronise with other clocks. Clocks are simulations, and magi depend on the true, celestial time to know when their magic expires. So if they were to have clocks, they would make clocks to synchronise with the sun and the moon.