I'm a beginner so sorry if this is a very basic question!
I'm trying to measure light in specific environments and moments (ex: in a warm morning, from another lamp etc) in order to replicate it. Is there any fairly cheap sensor that I could use that would give me these specific data in order to send it and replicate in another source of light?
The Arduino Starter Kit's "Color Mixing Lamp" project uses three phototransistors (or photoresistors in older versions of the kit, such as shown below) covered by red, green and blue lighting gels to form a lighting color sensor. This is a crude approach, but well suited for being easy for a beginner to understand.