Converting from W to W/m^2 for UV bulbs

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To convert the output of a 300 W UV bulb to W/m², one can calculate the emitting surface area and divide the power by this area, but this method will only provide an upper bound due to inefficiencies in light emission. For more accurate data, contacting the manufacturer, Osram, for specific specifications or searching their website for detailed data sheets is recommended. This approach avoids the need for an expensive radiometer while still aiming for reliable information. The actual irradiance will likely be lower than the calculated upper limit. Accurate measurements are crucial for effective cell irradiation in experiments.
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I have a 300 W UV bulb (http://www.bulborama.com/300R-E27-ULTRA-VITALUX-OSRAM-SUN-LAMP-TANNING-BULB-230-VOLTS-300-WATTS-p711.html).

I am trying to determine the W/m2 without buying a $3k radiometer.

I will be using this bulb to irradiate cells during a protection experiment.

Thank you very much for your help!
 
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Leigh said:
I have a 300 W UV bulb (http://www.bulborama.com/300R-E27-ULTRA-VITALUX-OSRAM-SUN-LAMP-TANNING-BULB-230-VOLTS-300-WATTS-p711.html).

I am trying to determine the W/m2 without buying a $3k radiometer.

I will be using this bulb to irradiate cells during a protection experiment.

Thank you very much for your help!

You can get an upper bound by simply calculating the emitting surface area of the bulb and dividing into the power. And hopefully the limitations of this are obvious: the conversion efficiency is not 100% so the actual number must be lower than this number. Possibly a lot lower.

The best answer is to call up Osram and ask them for the spec. Or scour their website for a detailed data sheet which likely has the spec or something from which it could be derived. Cost of a phone call or two with some of your time.
 
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BTW:

OSRAM SYLVANIA INC.
100 Endicott Street Danvers, MA 01923 Phone: +1-978-777-1900 www.sylvania.com
 
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