110 000 lux is the normal average in bright day light but even outside in a very sunny day our eyes don't received that must light on the retina
Damage to the retina induced by sunlight: solar retinopathy.
Light damage in the human retina due to excessive exposure to sunlight
is known as solar retinopathy. It has been estimated that direct gazing
at the sun with constricted pupil of 2 mm in diameter produces an image
of the sun on the retina of 0.16 mm in diameter in an emmetropic eye and
irradiance in that small area is about 11 W/cm2
The eyes irradiation show in the chart on a trip to a sunny beach is about 1x10^-3 W/cm. It's a factor of at least power 4 smaller vs direct sunlight.
This is the base illumination we must consider for a comparison, I will try to calculate for a 5mm pupil dilatation and 500 lux VR Headset
Other things to consider
- direct damage is not the only concern, bio-physiological impact could be possible
- LCD produce more blue light