You need some one who actually done this.
In my work shop at work we replaced nine 400 watt mercury lamps with 8 cree 40 watt LED lamps as part of a trial. (one LED light fixture was dead on arrival)
The LEDs do not appear to be putting off as much light as the mercury lamps I think it will take more like 11 LED assemblies will replace all the light I had from nine 400w mercury lamps.
Also the shop is a lot cooler. So cool that I was asked how I fixed the air conditioner that has not worked in years.
I have not tried it yet but I don't think you can just stick a lower wattage bulb in a ballast made for a larger bulb with out changing that too. I only use mercury lamps not sodium.
The instructions that come with the new ballasts I replace say something to the effect that if you try to put a 250 watt bulb in a 400 watt ballast the 400 watt ballast will try to push 400 watts of power through the 250 watt bulb and burn it out a lot faster.
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