I am doing test development to run smart contracts on Ethereum client. I downloaded geth, but still unable to setup geth client. I run geth command and it keeps on running for next 10 minutes. I think it is downloading the whole Ethereum block chain on my computer. I killed it fearing it may blow up my computer. Please tell me how to download the light version so that I can run test my smart contracts? Went through various articles on internet, but not able to find solution.