Well ive kept Sternfeldi's for about a year now with coiled bulbs and have not ran into any problems. But then again, thats no amount of time really learn from. But according to many respected keepers here, coiled bulbs arent to good for eyesight which leads to blindness.
I wonder though, why would Exo-Terra continue to keep selling products that would critically affect animal husbandry? Its leading to a chain of bad husbandry