bug99
Pulling my weight
- Joined
- Dec 27, 2016
- Messages
- 397
- Reaction score
- 154
Does anyone have a good feel for the light output per LED at some useful distance as it relates to camera shutter speed? I am not sure that LUX is a good measure at 850nm, as I expect that the camera is way more sensitive to 850nm than to visible light of the same lux rating (just a guess), but a LUX meter is what I have so there is that. What I was thinking is this: does one 1W LED produce about the equivalent of a 100LUX LED bulb (or that amount of sun) at say 25 ft from a camera (assume a Dahua Starlight Varifocal Turret (IPC-HDW5231R-Z)) if both are in B&W mode? Has anyone done any crude comparing of this?
It would be nice to have a rough feel for how fast the shutter/low the gain can be for a given amount of IR, to decide what to buy. I have a couple of large (very dark at night) indoor spaces, and was thinking about options.
Note: One nice thing about external IR light is that it is off angle from the camera, thus increasing the depth of field and reducing the hot spot glare.
It would be nice to have a rough feel for how fast the shutter/low the gain can be for a given amount of IR, to decide what to buy. I have a couple of large (very dark at night) indoor spaces, and was thinking about options.
Note: One nice thing about external IR light is that it is off angle from the camera, thus increasing the depth of field and reducing the hot spot glare.