On the bulb there will be printing. It will say how many watts and if it an hps(high pressure sodium), metal halide(mh) or mercury vapor(mv). Have a read or take a pic and post it up. You can take the wattage and google match it to lumens.
I would recommend a 400w high pressure sodium with a timer or photocell. It’s orange light but energy efficient.
I hope your clutching advice is better than your lighting advice.
400 watt HPS if far from energy efficient. You should go shame yourself at a Greta rally for that suggestion!
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