Nah don't cut it off it is still green and will be doing some work for the entire plant.
If you are in a tent and you have extraction fan and filter then you should be able to manage your heat quiet easily. The HP lamps are very well priced compared to even CFL to be honest. Invest in a dimmable ballast and that way you could always upscale in the future. Lots of well priced products out there.
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