The rainmaker jr. kit isn't suitable for use with chameleons. The main problem being that the pump can only run for 5 minute intervals MAX, without running the risk of overheating. Also, the pump cannot run dry and if it ever did, would most likely melt and become a huge firehazard.
Buy the Rainmaker I system, it can run continuously and can run dry.For nozzles use the wide angle, low flow ones (red).