Actually I think there are no "transformers" in my box, they are the power supplies for the LED's. The instruction manual I got has a section for "PSU", the 48" and 60" versions have 2 power supplies to take wall voltage and switch to 24VDC for the LED's. Pretty sure I'm just missing the step down (UP) transformer for the T5. The transformer @jon99 sent the link to was rated for 500W which would handle the 4x80W bulbs I think.The transformers are for the T5s. The reason you got 2 if because you have 80W T5's. It is not recommended to run wattage close to max rating on a transformer. You want 50% overhead. You use one for each T5 plug. If you only have one T5 plug then BRS must have sent you an extra by mistake.
thanks for all the feedback folks, love to have a place to ask questions.