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Sperti Fiji UVA/UVB lamp questions

Discussion in 'Beginners Area' started by Dan2, Nov 4, 2019.

  1. Dan2

    Dan2 New Member

    I'm learning about the Sperti Fiji UVA/UVB lamp and have some questions.
    First, here are links to the Fiji model and also Sperti's Vitamin D model:

    In those columns, it shows the UVA/UVB ratio for the Fiji is 75/25 and for the Vitamin D model 15/85.

    On page 2 of that pdf there's a graph of the spectral output of Sperti's Vitamin D model lamp. I emailed Sperti asking if there's a similar graph for the Fiji.

    Reviews on Amazon mention sun spots appearing after using the Fiji even though they'd been using tanning beds in the past without getting sun spots. Is the spectrum emitted by the Fiji much different from popular tanning beds? Are the sun spots likely caused by a lack of wavelengths other than the UVA and UVB range from the Fiji? Would including infrared, visible red, and the spectrum of Edison incandescents while using the Fiji protect against sun spots? Some reviews also mention quickly burning and peeling even though their skin usually tans smoothly and they're using the Fiji as per Sperti's recommendations. Is this likely another effect of a lack of infrared, red, and other warm wavelengths while using only the Fiji bulbs?

    The recommendations for using the Fiji are on page 3 of the user's manual:
    "Place unit 18" from skin" and "Exposure at distance less than 18" is not recommended."

    Will including infrared and visible warm wavelengths make it safe to use the Fiji for longer times at the recommended distance? And if so, is there any reason it wouldn't also be safe to use the Fiji for longer than that at a farther distance? The exposure of UVA and UVB would just be a function of the inverse square law, right? Does anyone here use the Fiji at a farther distance than recommended, maybe five to ten feet, also with or without infrared and incandescent spectra, for longer times with better results than following Sperti's recommendations of being closer than that for shorter times?

    @JanSz, I saw your post here
    and about the Vitamin D levels, you said,
    "5/17/2016 vit D=130.0 ng/mL(30-100) (winter, low sun 5drops Bio-D-Mulsion Forte)
    8/16/2016 vit D=80.3 ng/mL(30-100) (lots of sun, (3-4)drops Bio-D-Mulsion Forte)
    2/27/2017 vit D=63.0 ng/mL(30-100) (16min Red Sperti, no supplemental vit D)".
    Have you continued to use the red Sperti Fiji? If so, have you found a way that seems to give better Vitamin D lab results from using it? Have you found other lamps that are better for UVA and/or UVB other than the Exo Terras?
    Also, JanSz, to check I'm understanding what the graphs of the outputs of the white "Vitamin D' and red "Fiji" in that same post show, and to help clarify it for others, the fourth image where you drew the "white Sperti" curve in red on the "Red Sperti" black line graph, it means that although the ratios on this page
    say 75/25 UVA/UVB for the red Fiji and 15/85 UVA/UVB for the white Vitamin D and that may seem to imply that the white Vitamin D puts out a lot more UVB, the white Vitamin D doesn't put out a lot more UVB than the red Fiji, and the difference between the 75/25 of the red Fiji and 15/85 of the white Vitamin D is mostly because of a relative lack of UVA from the white Vitamin D lamp? So the only advantage of the white Vitamin D lamp, other than a little extra UVB, would be if we don't want UVA present along with UVB for some use other than simulating sunlight.
    Last edited: Nov 4, 2019
    mrc, JanSz and Sajid Mahmood like this.
  2. JanSz

    JanSz Gold

    Yes, but I still use Red Sperti. Not really sure if they are any better.
    Center of lamp matches my navel.
    Full timer=16 minutes, every day at very close distance, 8 min front the rest on back.

  3. Dan2

    Dan2 New Member

    From that post linked above, the 2nd image below is the spectral output graph of the red Sperti Fiji that JanSz posted.
    1 Jan-Sz-red-sperti.jpg

    I received a reply email from Sperti with the spectral output graphs of both lamps. Below is the red Fiji's graph they sent me. It looks like the UVB output at 312 nm, the wavelength studied for Vitamin D production, is higher in this graph than in the graph JanSz posted. So maybe Sperti uses a different bulb now that puts out a little more 312 nm UVB than before, or maybe the test results are more or less accurate?
    2 Fiji-Sun-Spectral-Output.jpg

    Below is the spectral output graph for the white Sperti Vitamin D model I was sent.
    3 Sperti-Vit-D-Spectral-Output.jpg

    So comparing the two shows that the 75/25 UVA/UVB output for the Fiji and 15/85 UVA/UVB output for the Vitamin D could be misleading if someone doesn't know the difference in those ratios is mostly because of a relative lack of UVA from the Vitamin D model. Especially if the higher level of 312 nm UVB output from the Fiji as shown in the graph I was just sent by Sperti is more accurate for current models than the graph JanSz posted in 2016.

    Here are the other pages of each 3 page pdf I was sent by Sperti.
    Vitamin D model:
    4 Sperti-Vit-D-Spectral-Output-2.jpg
    5 Sperti-Vit-D-Spectral-Output-3.jpg
    Last edited: Nov 5, 2019
  4. Dan2

    Dan2 New Member

    6 Fiji-Sun-Spectral-Output-2.jpg
    Notice the 3x higher UVA, little higher total UVB, and 20x higher UVC compared to the Vitamin D model.

    7 Fiji-Sun-Spectral-Output-3.jpg

    Here's the values for 312-312 nm range output of each lamp circled in red. So according to the graphs Sperti just sent me, the Fiji has more UVB output in the Vitamin D-producing range.

    8 Fiji-Sun-Spectral-Output-3-edit.jpg

    Vitamin D:
    9 Sperti-Vit-D-Spectral-Output-3-edit.jpg
    Last edited: Nov 5, 2019
  5. Dan2

    Dan2 New Member

    What other lamps do you use now for UVB? Are what you use for UVA the same blacklights you posted that I linked to in the first post of this thread?
  6. JanSz

    JanSz Gold

    I have made this picture two minutes ago.
    These lamps are in my room with me.
    Duchess Sunshine likes this.
  7. Dan2

    Dan2 New Member

    About those UV black lights in the photo, those are the same as you linked to in this post

    About the amount of UVA in sunlight
    From this post

    and from

    Since these black lights
    put out 385-400 nm, and the Sperti Fiji output tapers off after 365 nm, and the solar spectrum in the pictures above climbs after 365 nm, those black lights look like a good addition.
    @JanSz, do you know the amplitude of the wavelengths from those? That company also sells UV 15W-100W flood lights
    7W and 15W bulbs
    Wondering why you chose four of the 60W in context of making the spectrum in the room similar to sunlight. Is the proportion of UVA from those with the other lights you have a similar proportion as in midday sunlight, or do you use them for extra UVA?

    I remember Jack saying he used CFL black light blue like these
    Is there an advantage to either CFL or LED for the black lights? I've read about the possible effects from CFL mercury resonance - but I think I remember Jack saying something about the UVA being better than the small risk of that and so making the CFL worth it? - and LED flicker, but I don't know how the UVA affects those. Is LED flicker not an issue when the LED is putting out UVA?
  8. Dan2

    Dan2 New Member

    "Is there an advantage to either CFL or LED for the black lights? I've read about the possible effects from CFL mercury resonance - but I think I remember Jack saying something about the UVA being better than the small risk of that and so making the CFL worth it? - and LED flicker, but I don't know how the UVA affects those. Is LED flicker not an issue when the LED is putting out UVA?"

    Anyone know about this? I'd maybe get a higher wattage LED blacklight like what JanSz uses if the LED isn't an issue for UVA.
  9. I dont know the answer but feel the leds have a smaller environmental impact.

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