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gm68

UV radiation and artificial light

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The HIS SMP aftercare FAQ page indicates that UV light can damage SMP pigments (hence the recommendation to use a high factor sunscreen or hat when spending time outside in sunny conditions). While undoubtedly lower risk, is there a chance that UV radiation from artificial lighting could also damage SMP? I ask this beacuse I spend 8 hours per working day in an office lit by quite bright overhead fluorescent lighting.

Seems fluorescent lighting is one of the types than can leak UV. LED lighting has virtually none (so my house is ok :D).

However I don't fancy using sunscreen to go to work..... :huh:

Any comments/opinions?

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The amount of UV light leaked by a fluorescent bulb is negligible compared to that from the sun. Anyone who lives in a hot climate will tell you the damage UV light does to garden furniture over the course of a single summer. I guess the obvious comparison to make would be with UV sunbeds, think about how many powerful bulbs they have to cram into one of those machines to get to the strength where it activates the melanin in your skin. 

 

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Yes I suspect it's a non-issue, but I was thinking about it due to the duration of my exposure and didn't see it discussed in any earlier forum threads, which is why I brought it up.

A few quick google searches seem to back up this conclusion (apologies, I'm a engineer workng in the field of electromagnetic radiation so was interested enough to have a look ;)):

 

UV emissions from a cool white fluorescent tube are around 0.14 uW/cm2 (https://www.med.navy.mil/sites/nmcphc/Documents/policy-and-instruction/ih-ultraviolet-radiation-technical-guide.pdf)

while those from the UK noonday sun are around 2.8 mW/cm2 in summer and 0.77 mW/cm2 in winter (https://www.uv-light.co.uk/comparing-uv-light-elvs-with-natural-sunlight-exposure/). That's a factor of >1000 times lower for the fluorescent (and that was at a distance of just 50 cm from the tube).

 

Spurious UV emitted by a typical daylight fluorescent lamp appears to be concentrated in the UV-A band (similar situation to sunlight):

https://en.wikipedia.org/wiki/Fluorescent_lamp#/media/File:Spectra-Philips_32T8_natural_sunshine_fluorescent_light.svg

 

https://en.wikipedia.org/wiki/Fluorescent_lamp#Ultraviolet_emission

Fluorescent lamps emit a small amount of ultraviolet (UV) light. A 1993 study in the US found that ultraviolet exposure from sitting under fluorescent lights for eight hours is equivalent to one minute of sun exposure.[61] Ultraviolet radiation from compact fluorescent lamps may exacerbate symptoms in photosensitive individuals.[62][63][64]

The ultraviolet light from a fluorescent lamp can degrade the pigments in paintings (especially watercolor pigments) and bleach the dyes used in textiles and some printing. Valuable art work must be protected from ultraviolet light by placing additional glass or transparent acrylic sheets between the lamp and the art work

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