ATI Powermodule Reflector Help

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Due to the use of a canopy I'm unable to use one of the ATI powermodule units on my tank but I want to build a retro using their replacement parts.

Could anyone please describe to me how the Powermodule T5 reflectors are held in the light? I notice that they don't use a screw like the Sunpower.

Also, how far off the base of the reflector does the bulb sit?


Thanks for the help.