yes heat, you will see the results of coming out of the soil to hid. i used to keep em under low lumens for a week then prop up those long stems. simply place your newly sprouted seeds about 2 foot from your light. i will take pictures from a 2 day seedling under 800Watt
you can also track how this high intensity lighting will shorten your plants overall height and improves yield. We germinated ak48 may 5 we want to smoke it within 100 days from seed. so look it up and you can see the results as we see them over the next 100 days.
i have many others under this HID MH light i will get you some pictures