Don't need to. The MC blows away the T4, period. The stock MC bulb should produce around twice the lumens of the T4. Plus, the MC can be easily modded to put out 2-3 times the stock config.
Having said that, these are two very different lights, even though they are both rechargeable externally. The T4 is a li-ion driven 3W led, and the MC is a 8W or so Nicad incandescent. Besides the diffences in battery performance, the T4 will have a much higher (blueish) color temp, while the MC will outthrow the T4 significantly. To be fair, the MC is also much larger and heavier than the T4.
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