It's a choice between being broke now because the led light was very expensive or being broke later because the 600w hps sure does use a lot of leccy.
I'd recommend being broke later as with a first grow, there will probably be some street weed purchased before harvest. There are ways to spread out the leccy bill. Like don't answer the door to the meter reader.
Leccy suppliers tend to be cool about spreading out the debt so when the bad news does arrive, a polite phone call to them will work well.
Once you know that you will be long term self sufficient , then it's time to think about using less power to get the same result, or better. The hps will then gather dust but knowing that there is a spare light if needed gives peace of mind.
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