She's looking good so far. I wouldn't worry too much about the cotyledons curling up. It's perfectly natural for that to happen. I'd keep my eyes more on the set of leaves above those. The 1st and 2nd set of true leaves don't seem to be showing any signs of heat stress. They're looking very nice actually. Just as long as you keep the hps lights at a safe distance, she'll be fine. If you notice any small signs of heat stress, move her further away from the lights quickly.
Those 2 foot, 24W T5 fixtures aren't really that expensive and are great in the early veg stage. Just one of those can be enough light for 1 - 2 weeks from the moment they sprout. I believe they run for about $30. I always use one to place over my humidity dome and also after I transplant her into her final bucket. After which she's moved into the main lights. A while back someone gave me another 2' T5 as a gift, so I built a little stand for them. For the 1st weeks after she sprouts I use one bulb. 2nd week I turn the 2nd bulb on. 3rd week she goes under the main lights.
Here's a pic of that very setup back when my Ww was just a baby.