One book by avs recommends using them on jacksons. however, when i spoke to a pretty knowledgable person about reptiles and lighting, he was agains it. i can't remember his exact reasoning. i want to say that they are kinda unstandarized and emit too much uv. he was adimant against using them. i will see him later tonight as i am going to his store. if he is there, i will ask him and repost for you. he did say that people were having success using 2.0 & 5.0 bulbs together.