Globular clusters will be present at high redshifts , near the very beginning of the galaxy formation process .
Stellar evolution ensures that they will be much more luminous than today .
We show that the redshift distribution at nano-Jansky levels should be very broad , extending up to the redshift of formation .
A bracketing range of choices for the redshift of formation , spectral energy evolution models and population density evolution , leads to the conclusion that the sky densities should be around 10 ^ { 7 } per square degree at 1 nJy ( m _ { AB } = 31.4 mag ) in bands around 4 microns .
Such high sky densities begin to present a confusion problem at these wavelengths to diffraction limited 6m class telescopes .
These star-like , low metallicity , clusters will be a significant foreground population for “ first light ” object searches .
On the other hand they are an exceptionally interesting “ second light ” population in their own right .
Depending on the details of galaxy assembly , the clusters will have a noticeable cross-correlation with galaxies on scales of about 20 arcsec , or less , depending on the details of the buildup of galaxy assembly after globular cluster formation .
High redshift globular clusters will be an accessible , direct , probe of the earliest stages of the formation of galaxies and the buildup of metals in the universe .