If you want to light up a 2.5 x 2.5 space, that's 6.25 sqft. The T-5 at 125 watts gets you 20 watts per square foot, and the HLG at 96 watts gets you 15 watts/sqft.

Both are on the low side, but the HLG puts out 50% more lumens, so that would be equal to 150 watts of fluoro, more like 24 watts/sqft.

As far as heat, wattage = heat, unless you can mount the driver/transformer outside the tent.

The HLG costs 3 times as much and you get 50% more lumens with 80% of the heat. Fluoro bulbs will decay and fail while QBs last 50,000 hours.

Long-term, the HLG is the better choice, but T-5 prices won't be decreasing, while mid-power white LEDs will. You can probably buy the equivalent of the HLG cheaper next year.

I'm all QBs now, and I love 'em! But ... 3 times the cost - hard to make the case for other people to spend money they don't HAVE to.