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Old 06-26-2016, 05:38 PM   #1 (permalink)
 
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Lamp Meter Question

Refresh my memory on how this works? I had 3.5% lamps in my stand up and when I metered them right outta the box they metered 46.3ish ...I just tried a 6.5 lamp in the same unit outta the box and they only meter 26.1 ish. Logic would dictate that these are half as strong. Is this logic faulty? Please be kinda when explaining this to me. Thank you!
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Old 06-29-2016, 03:32 PM   #2 (permalink)
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Re: Lamp Meter Question

No. The 5.0 is good at reading the decline in a given lamp output but cannot be used to read one lamp against another.
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Old 07-10-2016, 12:16 PM   #3 (permalink)
 
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Re: Lamp Meter Question

You want an explanation?

Robert is correct, to an extent. However, precisely what your measurements DO mean is that the UVA output of the 6.5% lamps at the wavelengths for which the meter is most sensitive (response curve) IS much less than the output of the 3.5% lamps. Also, more than likely the UVB output, even though the % is almost twice as high, is close to the same between the two lamps, but you don't even know that for sure because a SMALL difference, or even shift, in UVB output can have a BIG difference in Erythema and Minimum Erythema Dose.

What would give more information, besides the spectral relative distribution graph of both lamps, is a MED meter, or a UVB meter. A MED meter is better for comparing lamps because the Erythema response curve is constant and it doesn't really matter where the UVA peak is for two different lamps.

This is an example of when UVB % does NOT mean anything UNLESS you have an idea of the properties of the UVA output. But, contrary to repeated statements over the years of otherwise knowledgeable and clear minded industry people from lamp reps to bed reps, UVB % DOES tell you something about the UVB output, IF, you have info on the UVA output.

If you want to reliably do more than check lamp life though, get a MED meter.

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Old 09-27-2016, 01:56 PM   #4 (permalink)
 
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Re: Lamp Meter Question

THE METER IS SEEING THE OVERALL OUTPUT OF THE LAMPS. THE ONE THAT IS READING IN THE FORTIES IS BLOWING THE OTHER LAMP AWAY. THE EXPENSIVE PART OF THE THE LAMP IS THE UVA SIDE. THAT METER IS SHOWING YOU THE HUGE DISPARITY BETWEEN LAMPS
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Old 09-28-2016, 07:54 PM   #5 (permalink)
 
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Re: Lamp Meter Question

That could be true but is not necessarily true. I've seen lamps that meter like crazy out of the box but 10 hours later they are way down, while some lamps with lower initial readings have a much smaller drop and last longer. In other words, there's a lot more to disparities between lamps than meter readings at zero hours.
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Old 09-29-2016, 09:32 AM   #6 (permalink)
 
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Re: Lamp Meter Question

IF A LAMP MANUFACTURER CLAIMS THEY HAVE A GRADE A,B,C,D LAMP. THEY ARE NOT KIDDING YOU.. THERE WAS A SYLVANIA LAMP IN 1986 THAT WAS RATED FOR 1500 HOURS IN A 100 WATT. THE PROBLEM IS YOUR CUSTOMERS GET THE IMPRESSION THAT YOU NEVER CHANGE YOUR LAMPS.. YOUR DILEMA IS TO FIGURE OUT IF YOU WERE SOLD AN A,B,C,OR D LAMP
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