Hi,
The Arcaida T5 lamps have an almost unnoticeable graduation throughout the lamp. It's around 5% variation from the ends to the middle of the lamp.
Yes you can have one end higher than the other, this will in effect slightly reduce the index at the highest point.
Have a try and measure it with your meter to be sure of the graduation throughout your photo gradient.
As long as the lamp is always above the animal and never to the side it dies not matter what you try in terms of fitting method.
Good luck!
John
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