function createStream1( lambda ) {
		return new RandomStream( lambda, opts );
	}
Returns a readable stream for generating pseudorandom numbers drawn from an exponential distribution.

@private
@param {PositiveNumber} lambda - rate parameter
@throws {TypeError} `lambda` must be a positive number
@throws {TypeError} options argument must be an object
@throws {TypeError} must provide valid options
@throws {Error} must provide a valid state
@returns {RandomStream} Stream instance