m0useanswered grow question 3 years ago sf1000 is only 100W VS your Vipar 300W. it would not be a upgrade if you used just the sf1000 for flower, it would be a massive downgrade.
Keep using the 300W. If you wanted to add the sf1000 on top of the Vipar 300W and make it 400W then sure it could work in a bigger tent, but its par map in the tent will be weird.
your tent is 80x80x198 cm or 2x2x6'6" yea? L x W x H, then just use the 300w don't add in the sf1000. it would be better for vegging out a plant in a separate tent.
Good Luck!