So I've been researching and have a few questions on lighting. I know there are UVA and UVB lights. I've read that Russian tortoises need UVB, but what about UVA?

Also I've been checking out the RussianTortoises.org site and they recommend Active UVheat T-rex bulbs or Capture the Sun bulbs as 100watt flood lights, they say an additional heat lamp may be necessary to reach proper temps. I guess I'm wondering how much heat these others usually put off. Question being if they put off a lot, is it okay to leave this bulb at just the warm end of the enclosure so as not to mess up the gradient heat...

Thanks guys

UVA is the light plants need for growth. The active uv heat T-rex bulb I believe is the MVB (mercury vapor bulb) this is a full spectrum bulb and puts out quite a bit of heat. I have mine (t-Rex 100 watt flood) placed on the warm side and I have a IR (Infrared) bulb set up on a thermostat as my house sometimes get rather cold and drafty. If the temp drops it kicks on to warm things up a bit. Here is a site with the stats on these type bulbs. http://www.uvguide.co.uk/mercuryvapourlamps.htm