Light meter
- Thread starter killz
- Start date
sickstoner
Well-Known Member
why would you have to change the bulb in a HPS?
cdrippper2
Active Member
The meter you need costs more than a bulb....HPS generally don't loose that many lumens over their life compared to MH. I'd wait until it starts looking really black on the ends of the arc tube or if you ever catch it cycling. Or you can calculate the hours you have on it vs it's expected life.
aficionado
Active Member
Depending on your camera, you could use it (the camera) as a rough lux/ft. candle meter itself. A light value (LV) of about 20 equates to about 10k foot candles. With a little math you can obtain the light intensity.
Personally, I use a portable lux meter for recording light intensity. Its a great unit that can help determine relative lux/ft candle.
http://www.bghydro.com/BGH/itemdesc.asp?ic=HLLALMDHA
Personally, I use a portable lux meter for recording light intensity. Its a great unit that can help determine relative lux/ft candle.
http://www.bghydro.com/BGH/itemdesc.asp?ic=HLLALMDHA
will that also give me a K reading
but then I wouldn't be able to buy a cool toy like a light meter.
aficionado
Active Member
K reading is light or color temperature - not intensity. You can change the K value of your camera's white balance using cards, but I don't think you can use the camera to take a reading. You will need a PAR sensor or other photon sensitive equipment that can distinguish light wavelengths.