If this happens spray the soil a little more to knock them down. The cooler should get about 12-13 hours of light a day through the lid. Ambient room light is fine. Keep it out of the direct sunlight so it doesn't get too hot. Be on the lookout for any mold in the jars and be prepared to immediately remove them from the cooler.
Mold can be very hard to spot so be meticulous.
The most common molds to look out for are a green mold and a yellowish slime. If a jar is contaminated, carefully check the jars it was sitting next to. They may be contaminated as well. For this reason it is a good idea to space the jars as far apart as possible in the cooler. If contamination is found wash off all the outside jars with anti-bacterial soap, change the tin foil, and spray the cooler and lid with lysol before replacing the good jars.