Subject: What effect will continuous 24 hour light have on the growth of the radish?

I am doing a project based on photoperiodism for an agroecology class.  I 
can't seem to find much information that explains possible effects on 
plants that are grown under continuous light.  I selected the radish to 
grow, simply because of the fast growing period.  I will be allowing my 
control group to see only regular daylight in regular amounts.  My 
experimental group will be in regular daylight and then under artificial 
grow lights with a max. of 130 Watts.  The light will be continuous for 24 
hours.  I am using icicle radishes and plan to measure the growth based on 
the length and diameter of the radish, as well as taste testing both 
radish group at the end.  I don't know what sources to use to research 
this area or even what to hypothesize regarding my project.  Could you 
please let me know what possible effects the continual light will have on 
the radishes as well as text/information to research from?   I greatly 
appreciate and anticipate your response.  Thanks!!!

Re: What effect will continuous 24 hour light have on the growth of the radish?