I wear a lume or tritium watch to bed and prefer light weight, titanium or plastic. These two divers are plastic.
I've had the Tawatec E.O. Diver T25 for about a year and love it. Specs are:
46x12x33mm 47 grams on Maratac Zulu. (33mm is dial diameter)
The Isobrite T100 is my newest acquisition. Despite finding T25 more than adequate, I had a curiosity about T100. I was drawn like a moth to the flame. Specs are: 47x14.2x33mm 60 grams on Maratac Zulu.
(The two bezel tritium capsules and the second-hand capsule are T25)
Both watches had crummy bezel ratchets which I easily fixed by prying off the bezel and snipping the square lugs off the plastic ratchet. They are still unidirectional but now move easily and smoothly. I also rounded the sharp corners on the strap lugs. Despite being plastic, they scratched my wrist.
For the first comparison I went into a closet after being in sunlight for a few minutes. I could immediately read the T100 but not the T25. Even after 5 minutes of dark adaption I still couldn't tell the time on the T25. (I can immediately read an ordinary lume dial when going from bright light to darkness because the initial brightness of a charged lume dial is stronger than tritium).
Next I noticed that in partial light the T100 lume showed nicely while the T25 lume was almost invisible. That alone made the T100 appealing.
I was worried that when I wore it to bed it would seem blinding to my dark adapted eyes. An Amazon reviewer wrote, "You will wake up at 3:00 AM and scare the hell out of yourself!" But this wasn't my experience. It was bright, but not unpleasantly so.
So it's a keeper, though I think the Tawatec is prettier and I like its thinner profile.
This is how they look in partial light:
This is how they look in darkness when I'm only slightly dark adapted:
This how they look when I'm fully dark adapted: