...from Big Apple is the bulb I have been using. Unbelievable bulb. It has high uvb output and a WIDE spread(like an Osram).Best to have a meter with this bulb. Downside:1 of 4 of mine burned out fast.Upside to the downside: great return and replacement policy/fast service. If you would try to replicate this bulbs spread with a T-rex, you need 3-4 of them.Huge uvb gradient with this bulb.In a small terrarium you could use it for less hours a day, the cage will be flooded with uvb. Like all bulbs they vary, meters are good. Shamu(U.flavifasciata) is getting upgraded to a bigger cage, so bulb #5 is on it's way now. So everybody buy them so they keep making them(haha).Best bulb I know of available to U.S.but it's only been a couple months so I don't know how long they are good for.

