PIN Photodiode BPW34BS

[Dat Tran]

In my project, I use the PIN Photodiode. As the title, it's BPW34BS, I'm reading it's datasheet. But i don't understand some problems below:
1. What is the Dark current?
2. What is the Spectral sensitivity?
3. Open-Circuit Voltage (Ev=1000 lx). So, "lx",what is mean?
4. I don't know mean of "Temperature coefficient of Vo" and "Temperature coefficient of Isc"
5. Noise equivalent power
     

Any ideas Help me
Thank you all

Oh! I'm Sorry! This is document which I read: https://drive.google.com/open?id=0B73oNVka3W6bb25tbHhSRTdfVFE

[Dat Tran]

Anybody

[w2aew]

In my project, I use the PIN Photodiode. As the title, it's BPW34BS, I'm reading it's datasheet. But i don't understand some problems below:
1. What is the Dark current?
2. What is the Spectral sensitivity?
3. Open-Circuit Voltage (Ev=1000 lx). So, "lx",what is mean?
4. I don't know mean of "Temperature coefficient of Vo" and "Temperature coefficient of Isc"
5. Noise equivalent power
     

Any ideas Help me
Thank you all

Oh! I'm Sorry! This is document which I read: https://drive.google.com/open?id=0B73oNVka3W6bb25tbHhSRTdfVFE

1) Dark current is the leakage current through the diode when reversed biased with 10V and not being illuminated with light. The spec indicates 2nA typ, and 30nA maximum).
2) Spectral sensitivity indicates how much photocurrent results from a given optical input power.  Spec shows 0.2 A/W, which means that you get 200mA photocurrent when illuminated with 1 watt of optical power at 400nm wavelength.
3) I assume lx means "lux", another measure of optical illumination.  Indicates that the diode terminal voltage will be 390mV when illuminated with 1000 lux.
4) This tells you how much the open circuit voltage (Vo) described above will vary with temperature, and how much the short-circuit current value will vary with temperature.
5) Is used to compute the noise contribution from the photodiode, useful when you need to predict the total noise in a circuit to estimate SNR, etc.

[Dat Tran]

Thank you so much, w2aew!

[Dat Tran]

Very detail, w2aew.
thanks you