Yes , they have to warm up some 2 or 3 min to full brute, but put out alot of light. Sodium are what most yard lights are iirc. The metal halide have a yellowish light. I installed 4 of them under a 80x100 barn several years ago and when they were on it was lit up like a prison. The only draw back is when you turn them on they don't need to be turned off until your thru. It takes about 15min for them to cool down and come back on.