If you need a small sensor to get not just the ambient light, but the hue and infrared values, you might want to have a look at the MAX44006 and MAX44008 from Maxim. The chips both pack RGB, ambient light, IR and temperature sensors into a 2x2mm footprint. They're also touting very low power consumption numbers (15ยตA active) and are apparently very sensitive with 0.001Lux steps. However, his level of integration doesn't come cheap: the budgetary prices at 1000pcs start from 4.69USD and the small size means the only interface is I2C. Hobbyists will be happy to know that Maxim is quite liberal with their free samples, and such are available of these sensors as well.
More: MAX444006/MAX44008, datasheet, pricing
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