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Hi tnvr,

Welcome to TPT!

Typically the distance between nodes (where the leaves emerge from the stems) increases when light levels are too low. Increasing the photoperiod may help but I find it seems to be more related to light intensity.
 

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Yeah, plants "stretch" toward the light if it's not strong enough, resulting in longer internodes (section between nodes - leaves), rather than compact growth. You will notice shorter internode sections that are closer to the top since it is obtaining more light.

Red spectrum of light also plays a factor in internode spacing. More red spectrum light will have plants with shorter internodes.
 
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