I got my bulbs from www.bigappleherp.com. I got a Sunforce 160 watt bulb for my 55 gallon. Their prices are very reasonable. Also there has been some skepticism on the PowerSun MVB as far as its safety and effectiveness. I have had no problems with mine and my dragon is active and happy. No signs of distress or anything. Depending on your tank size you may need certain wattages. I have been hearing mixed things about MVB's but again i have nothing bad to say as of yet. I am planning on building a custom enclosure in the future and i may switch to the Flourescent tubes because they put out more light than one MVB. Sorry for rambling on but i hope this helps