I think they just go off ambient light. Of course, there's other factors which help your Scorpion know if it's day or night like the temperature for example.I have been hearing a lot about IR lighting.
What wattage bulb I'm going to need to keep his climate the same as my 50Watt basking spot lamp.
His temp right now has been staying pretty steady at 86-88F when the lamp is on and 78F through the night
Humidity has been sticking about 80-82% with the lamp on and about 90-92% humidity with the lamp off overnight.
I'm getting him a new P.imp friend from Georgia, this lady is giving him away to me.
Waiting to see the shipping costs, plus I get his whole setup for $30 if I want it.
With him being more aggressive right now is its wise to put in a new P.imp?
I'm excited
Edit:
Now, with an IR light setup, will he think it is night time 24/7, or will he just go off ambient light?
I'm sure there will be some 'checking out' of eachother but once you're through that they should be fine assuming you have sufficient hides. If they are male & female then you could well see mating behavior straight away. If you post a picture up of the pectines of each Scorpion before you put them together, we'll be able to tell you the sex of each.
Also, be sure that both are mature. I know these Scorpions are communal but if/when molting comes around it's best to have it alone for that time.
PS. Pectines are the brush like teeth underneath the scorpion, just put it onto a piece of glass and get a good picture from underneath.