What's the difference between the 6.0 and 7.5 meters?

[kpowr82]

Okay Steve,

I'm curious to know the difference between the 6.0 and 7.5 meter. Is the 7.5 meter expressing the same thing as the 6.0 with different units?

I know eeff is the big "number" that the FDA is regulating...0.6 W/m2 US vs. 0.3 W/m2 EU

[solarmeter®]

No - the 7.5 is expressing the same thing in different units as a 7.0 or 6.5 meter.... not the 6.0.

Conversion from a 7.0 is nearly impossible to explain... but from a 6.5 UVI meter it is simple: UVI/40 = W/m² Eeff.

The EU 0.3 "rule" is based on a 12.0 UV Index max: 12/40 = 0.3

[MicroSpa]

Solar, I noticed on your website that your Red Light and Blue Light meters are separate. Is the sensor you use only available for one spectrum?

My LED Therapy equipment operates in the Red, Blue and IR range and it would be ideal to have something that could measure each from an individual unit.

[solarmeter®]

Is the sensor you use only available for one spectrum?

Yes. I am too stupid to make meters with multiple sensors... sorry.

Try International Light, Solar Light Co, or Optronics. Just save up a few thousand bucks before contacting them. Single sensor meters are much cheaper and more accurate.... because only ONE calibration circuit (sensor input, output, amplification, adjustment pot, oscillation filter, a/d converter, etc) is required.

Double the pleasure is not double the fun...

[MicroSpa]

Yikes, that's a little outside my price point. I guess two might have to do.

Thanks

[solarmeter®]

What IR bandwidth (and peak wavelength) does your LED device emit?

I am smart enuf to make an IR meter.... if the demand was there. But IR full bandwidth is huge ... from 800nm all the way up past 100000nm. So the meter would need to isolate whatever bandwidth "works" with red/blue light.


Methinks this is in the "near-infrared" zone.... and therefore not suitable for checking with a Radio Shack digital thermometer or turkey cooker instrument. Maybe around 850-950nm ??

[MicroSpa]

Bingo! You are correct.

I could definitely see a market for you with Red & IR in the tanning industry however the spa industry, that has someone qualified to operate, has the blue light also in many of their units(this varies by state.)

Here's the spec's


Light Source: 4080 SL SMT LEDs
Wavelength:
630nm - 112mW/cm2
133.8361 j/20min
880nm - 82mW/cm2
99.42112 j/20min,
420nm - 86mW/cm2
104.0098 j/20 min
Custom & Preset Settings
Pulse: CW & Variable
Energy: 1 - 248 joules

[solarmeter®]

OK - got it. Thanks. Will take that under advisement for the future.

To be more precise... I need to know not only the peak wavelengths - but also the bandwidth. No light source emite only a single (peak) wavelength... except perhaps an expensive laser.

No radiometer can detect only a single bandwidth intensity. That requires a spectral radiometer (about $40K for the gold standard Optronics). A radiometer detects irradiance total under a specific SPD bell curve.

So - one of these days when I'm not so busy - I will ask this place http://www.mylightwave.com/docs/DLX_1200.pdf for their SPD curves. They will probably say take a hike because 1. proprietary or 2. They don't want people metering their stuff.

Regarding the Blue Light meter: It was created to measure biliruben lamps peaking at 450nm. Your LED's peak at 420nm. The 9.4 meter's response at 420 is 30%. See graph below. So you would need to multiply the reading by 1.70 to get an accurate reading. Eg: Meter reads 50.6 x 1.70 = 86.0 mW/cm².

[MicroSpa]

Solar, I don't have the manual with me at the moment, it's in the store however I'm not sure if the info you need is in there.

Here's the link to one of my pieces of equipment. Lumiere is the other.

LED Light Therapy - Blue & Red, Infrared Light Therapy, & PDT