It would depend on what kind of LEDs they are, how many there are, what color spectrum they have, and how long your use cycle is.
Look for a lighting spectrum number. Should be something like 10,000K or 6,000K. Also, find a PAR or LUX number and they should be listed at a certain depth.
Ex: PAR 130/LUX 12700 at 12 inches, PAR 64/LUX 5870 at 24 inches
Once you know the spectrum and the intensity at the depth you are using, you can take a good guess at what affect they will have on growth.
"The only barrier to knowledge is the belief that you have it."
Hedgehogs... why don't they just share the hedge?