04-09-2002, 10:26 PM | #1 (permalink) |
Join Date: Jan 21 2002
Posts: 2,709
Rep Power: 23 | Don, You had mentioned in your different post that "if you one have one meter a 7.o is the one to get" Why???? Another question... Where do I get one? I asked my dist. he said he could find one for me.....umm ok..whatever that meant?? At the present time I am changing bulbs based on hours. 550-600 hours in base beds and 450-500 in my VHR beds. I just don't want to waste good bulbs. So I have been trying to learn more about metering, MEDs, etc.. Thanks in advance. Mj |
04-23-2002, 10:17 AM | #2 (permalink) |
Join Date: Nov 13 2001 Location: MI
Posts: 861
Rep Power: 23 | Start out with the regular model 5.0 (total UV), which gives the highest resolution (dynamic range utilization) for measuring aging of lamps. Rule of thumb is change lamps when they fall 30% from new values. This model also seems to be better for HP lamp's relative effectiveness, because they are mostly UVA and have erythemal output low enough that the other models are of limited value. The browning/bronzing power of HP seems to be reflected best in model 5.0 readings. Once you become used to the regular meter, you might want to upgrade to the 6.0 and 7.0 at a later date. The 6.0 UVB is best for checking acrylic transmission (since acrylic blocks B as it ages/solarizes and lets most A transmit thru). You can also determine approximate percent B from dividing model 6.0 reading by 5.0 reading. The erythemal meter 7.0 picks up EAS weighted irradiance in MED/hr, so you can relate readings to Te time (240/MED reading). Can directly compare different lamp/bed combinations' effectiveness. Must be used at "body position" to have real meaning. The model 6.5 UV Index meter uses same sensor, but is set to NWS/EPA outdoor scale. It is hoped that after the next FDA meeting they will finalize MED definition for outdoor/indoor usage, so model 7.0 values may change as a result. Note: Model 7.0 can also be used for aging and acrylic transmission tests. Most all distributors carry model 5, and several carry all models. Steve ("spam" only in response to question) |
04-23-2002, 12:15 PM | #4 (permalink) |
Join Date: Jul 6 2001
Posts: 1,875
Rep Power: 23 | Steve - The spam is forgiven. I know many of us, myself included, had no idea what the differences were between the different models. We were changing bulbs based on hours also. When we started changing them again at the beginning of the year, we purchased a 5.0 meter. We are now happily metering our beds. |
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