type (
	S1LBConfig struct {
		LoadBalancer struct {
			Rules []struct {
				Lb struct {
					SecurityGroups           []string
					Subnets                  []string
				} 
			} 
		} 
	}
)

SecurityGroups:           pulumi.StringArray{pulumi.String(s1LoadBalancerConfig.LoadBalancer.Rules[k].Lb.SecurityGroups)},

Cannot convert expression of type '[]string' to type 'String'