UV-C bulb with 254 nm 15 Watts, lux vs lumen comparison chart

Dear All, recently we have procured new PCR hood which has integral UV-C bulb with 254 nm and 15 Watt capacity. I need to have standard comparison chart for Lux and lumen with it I can compare in-house measured value of light and by that way I can be assured that measured value falls with in the require range. please share, if someone have the standard chart for UV-C bulb for 254 nm at 15 Watts.