Posted July 03, 2016
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(It's obvious that an incandescent lamp will have less HEV than a white LED, because they're radiating different parts of the spectrum, but there's no particular definition of what they need to show.)
As for light close to the eyes, I imagine it's as with sound and headphones: it doesn't matter in theory, but it does give an opportunity for excess. With headphones, people often tend to set the volume too high. The same may be possible with a VR display. But I think that if people follow normal calibration procedures, this shouldn't be a big issue. That said, I'm sure some games will be set too bright, with people needing "virtual shades" and turn down brightness. That said, most games, certainly AAA games, support changing brightness, and IIRC that's also something that's possible through drivers.
A good VR headset will let your eyes focus normally. You certainly don't focus on the lenses any more than you focus on your glasses when you wear them.
Post edited July 03, 2016 by ET3D