Hi there, I recently read about the Mercury Vapour bulbs and how great they are for torts so I bought the Exo Teraa Solar Glo Mercury Vapour Lamp, 125 Watt on amazon for my russian tortoise. It was a lot more expensive than most of the other bulbs but I wanted a good one! It was great for a while then kept flickering on and off.. so I sent it back today and so my poor tortoise only has an infrared bulb til I buy him a proper one! I would really love to know the best bulb to buy him, brands etc as Im a bit lost now, might try the ExoTerra one again. What do you use for your tortoises? Also Im on a student budget so I was hoping to keep the bulb cost at a minimum but of course if Simon needs it I'll buy it for him Would really appreciate some lighting tips as this whole area has always confused me a bit.. Thanks