Seed Germination - Day/Night Temperature Variation

Is there a solution to germinating Exotics that benefit from wide temperature differences for Day/Night?

I don't have a fancy propagator, but do they come with thermostat that do dual-temperatures based on a 24 hours timer?

If not would, for example, a light bulb [on a timer] in the propagator to raise the "day" temperature do the trick?

I've done it manually, in the past, moving the seed trays from Hot to Temperate, but some days they got all "day" and others all "night" temperatures 'coz I'm pretty hopeless at doing things to-a-routine ...

 

That's the essence of a cracking good idea. Blindingly obvious, but I never thought of it!!

I actually have a timer with little "fingers" around the 24 hours and they are 15 minutes each - so I could toggle 15:15 at night, or even 15:30 or 15:45 if that would be needed to get the temperature down low enough.

Thanks John. Seeds are arriving soon

 

Slight flaw in the plan is that I also have to buy the propagator!

 

I do the same, but my propagator is inside the house which is not that cold at night. So I just use a time switch to turn the heat on during the day. Seems to work.