Early results from the 70 \mu m observations of the Spitzer Extragalactic First Look Survey are presented .
As a whole , about 90 % of the population show infrared colors that are consistent with the spectral energy distributions of the local IRAS population of luminous infrared starbursts , while approximately 10 % of the sample show warm infrared colors consistent with AGN activity .
The mean redshift for the population is z = 0.2 , and the mean total infrared luminosity is about L ( { ir } ) = 2 \times 10 ^ { 11 } L _ { \odot } .