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The LED is RED so of course it is 2.0V, not 3.5V like a blue or white LED.
They take an ordinary LED and stick it in a tightly focussed case. Its beam is only 6 degrees or 12 degrees because both numbers are spec'd. The graph shows 10 degrees.
If it is not pointing directly at you then you might not see it. I like wide angle bright LEDs.
No.Most high intensity leds have a narrow beam.
The candela is the SI base unit of luminous intensity; that is, power emitted by a light source in a particular direction, weighted by the luminosity function (a standardized model of the sensitivity of the human eye to different wavelengths, also known as the luminous efficiency function).
going to look at 0.5 and 1 watt leds, i need a large area light source with around 5,000 lumens total,
I have to use leds, lots of small lower power leds rather than one big one
You will need about 15 XP-Gs running at 1A, a suitable powersupply, and especially GOOD COOLING.
With small 20mA LEDs, you'd need hundreds.