Dimensions BETWEEN Icecap endcap brackets - NEW QUESTION

coralreefer

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I am designing/building my canopy and was searching online (with no luck) the dimensions for the IceCap endcap bracket. I am trying to determine how many lamps I will be able to fit into the canopy and where.
 
Can anyone measure and tell me the long distance between the endcap bases mounting holes - How far apart are they spaced to hold a T5 54W bulb - I know it is probably not exactly 48" and I am making a mounting bracket to install inside the canopy. Dont have the light setup yet to measure myself.
 
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