They are rated for use for about 2-2 and a half so I'd say yea you need a new bulb. Would you be a dear and get me the average temperature of your house, room, or the general area the plants are in. What I would like to know is what the temps would be in your grow room if the light was not there at all. Also I'd love to hear your insights as to how much the heat shield is working. I actually was looking at one of those a while ago and made a thread about it. Again since your grow is very similar to mine, I'd like to know as much as possible so I can improve my own. Thanks a lot.