Yeah it seems the focus is always on high light or low light even the t5 flourescent bulbs are almost all high light.Unfortunately, I can't answer your question but your experience helps me a bit because I was looking at the Marineland APLS for my 50 gal, 36"x18"x18". If the lights too narrow for your 38 gal, It'll be too narrow for my 50 gal 18" deep tank.
So, suggestions for a 36" medium light fixture would help me as well. So far, it seems all the LED fixtures I've found are either low light or high light.
Wondering if you could place electrical tape over some of the LEDs on a high light fixture to get down to medium light?
electrical tape might work but I would check with someone who has more experience with LED fixtures.
I'm tempted to just DIY a LED fixture but I'm afraid to burn down the house.