I dunno it was the one bulb in the cham kit that Bill said could be used... And in the info he put out after the class it says nothing about replacing the bulb for heat that comes with the kit https://chameleonacademy.com/chameleonkit/ I would think if the blue daylight bulbs actually were harmful then it would be something he would mention to replace.Following this and think in the future I shall err on the side of caution and just provide the vague statement that colored lights are not ideal for sensitive reptile eyes.