If the lights, when on, create heat, then running them on a night shift can keep plants warmer during the coldest times (night). It can also avoid overheating them if daytimes are too warm with the lights on. This is good.
If this schedule creates a situation where the day and night temperatures are almost the same, you may find some or all of your young plants start blooming prematurely -- one recent post featured a white fatalii that produced flowerbuds at a 4" height. It's not a disaster, and -- frankly -- it's kinda cute... but it's not ideal conditions for such a young plant.
While it's tempting to try to produce a fruit or two at this early age, it's going to stunt it's growth at least a little, possibly a lot. Even without pollination and fruitset, the cost in metabolic energy to produce flowerbuds will slightly impede growth.
Don't panic if it happens. Just remove the flowerbuds, and try to adjust the environment so that the lights-on temperature is about 5°F warmer than the times when the lights are off.