I recommend a good LED for your tent. Much more efficient overall, saving you money every month. If you’re in a part of the country where home cultivation isn’t legal, that HPS will show up on a FLIR camera like a giant hurricane in a satellite image. The driver for the LED light will add enough heat along with the light itself to keep your tent most likely at 21 Celsius or around there if the tent is closed. Assuming you’re in a cottage or flat and the ambient home temp is near 17 celsius in the coldest winter months. Cheers!