Thanks Aliza..... I am looking for something I read that geckos could get poisoned because of using incorrect light..... The thing is I have a male whos all his life (he is one year old) has been VERY HUNGRY, I mean, he eats EVERY DAY (if possible), ALWAYS at about 6 -7 pm he comes out of his cave and starts to vander around looking for food and has always been very eager to eat... 4 days ago he vomited a mix of half-digested mealworms... the next day he vomited again, and since then he doesn't come out and refuses to take food, I offered a cricket yesterday and he just went back to his cave, I understand it has been too little time to get too worried but this is just not like him!! I am concerned and I was looking for reasons he might feel bad, or sick, he has that kind of light, but I (to be 100% honest) use it less than once a week, sometimes when I remember I turn it on for a few hours and that is it.... he lives alone in a 25 gallon tank, has 2 hides, plenty of food, calcium, vitamins.... I keep him in sand covered with aquarium little pebbles (I didn't want to get rid of the sand because my boyfriend paid a lot of effort in biulding him a nice enclosure, all my other animals are in paper towels), and I always hand feed him, I NEVER put the food on the sand, and most of the sand is covered with the pebbles anyway, and if the food falls down into the sand I remove it immediately in order to wash it... he weights 48,20 grames now... I weighted him yesterday in order to monitor if he looses any weight.... I am just checking what possible issues might be wrong with him