Pila 150S batteries are rated at 1000mAH while a stock CR123a is 1300 or so.
Two 150S = 2000mAH
Three CR123a = 3900mAH
The Pilas wont sag in voltage near as much as the CR123A's though, so it may actually stay bright longer than the CR123's do. Fresh off the charger Pilas will put out 8.4 volts combined, but the internal resistance of a CR123 will lower their total voltage to about the same level anyway, so the Pilas will be about the same brightness, maybe a touch less.
According to flashlightreviews.com the 150S batteries fit the TL3 but dont power it, which is most likely due to the positive contact being different. Modifying the light, or adding a small magnet may rectify the problem.
from FLR
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The only 9V light I have successfully tried the Pila batteries in so far is the Surefire M3 and output was reduced but not by very much. The M3 was able to throw a very white light and very bright beam (using the standard lamp assembly - high output not tested). Reduction in throw was less than 10% per my meter readings. Keep in mind that I do not know how long that level of output would be maintained.
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Light reduction should be similar to the M3. Cant promise you could make the batteries work in the light, but with some ingenuity you should be able to. I dont have, nor have I handled a T3 so i dont know what the insides look like. (are you good with a camera? /ubbthreads/images/graemlins/wink.gif)