Fluorescent lamps and health

Common T8 fluorescent lighting fixture

Fluorescent lamps have been suggested to affect human health in various ways.

Time

Nocturnal exposure to light in the short wavelength ranges (below 530 nm) generated by some fluorescent lamps may interfere with mammalian circadian rhythms due to its suppressing effect on melatonin production.[1] Suppression of melatonin has been linked to cancer in some studies.[2]

The ability of fluorescent lamps to suppress melatonin in humans after nocturnal light exposure is strongly dependent on the color temperature of the lamp. While lamps with daylight color (6500 K) can significantly suppress melatonin, warm white lamps (2700 K or 3000 K) have a significantly lower effect on melatonin suppression. Cool white colors (color temperature of 4000 K) have a moderate effect on melatonin suppression.[3] Therefore warm white lamps are recommended for use at nighttime in order to prevent melatonin suppression.[4]

Flicker effects

Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz. This flickering can cause problems for some individuals with light sensitivity.[5] Such lamps are listed as problematic for some individuals with autism, epilepsy,[6] lupus,[7] chronic fatigue syndrome, Lyme disease,[8] and vertigo.[9] Newer fluorescent lights without magnetic ballasts have essentially eliminated flicker.[10]

The normally unnoticeable 100–120 Hz flicker from fluorescent tubes powered by electromagnetic ballasts are associated with headaches and eyestrain. Individuals with high flicker fusion threshold are particularly affected by electromagnetic ballasts: their EEG alpha waves are markedly attenuated and they perform office tasks with greater speed and decreased accuracy.[11] Ordinary people have better reading performance using high frequency (20 kHz – 60 kHz) electronic ballasts than electromagnetic ballasts, although the effect was large only for the case of luminance contrast.[12]

Early studies suspected a relationship between the flickering of fluorescent lamps with electromagnetic ballasts and repetitive movement in autistic children.[13] However, these studies had interpretive problems[14] and have not been replicated.

Compact fluorescent lamps (CFL) are driven by electronic ballasts which operate in the range of 25–60 kHz, which far exceeds the human ability to perceive flicker.

Ultraviolet radiation risk

An open (single envelope) CFL.[15]
An encapsulated/closed (double envelope) CFL

Some fluorescent lamps emit ultraviolet radiation. The Health Protection Agency of the United Kingdom has conducted research concluding that exposure to open (single envelope) compact fluorescent lamps (CFLs) for over 1 hour per day at a distance of less than 30 cm can exceed guideline levels as recommended by the International Commission on Non-Ionizing Radiation Protection (ICNIRP).

Not all open CFLs produce significant UV emissions. However, close proximity to bare skin can result in exposure levels similar to direct sunlight. The Health Protection Agency of the United Kingdom recommend that in situations requiring close proximity to the light source, open (single envelope) CFLs are replaced with encapsulated (double envelope) CFLs.[16]

In 2009, Natural Resources Canada released a report[17] describing the possible UV exposure from several types of lamps. The report states that at 3 cm distance, the recommended daily exposure to ultraviolet radiation for skin and eye damage (if looking directly at the lamp) was attained between 50 minutes and 5 hours depending on the type of lamp. The report observes that such a close distance is unlikely in actual use. The report also states that most bare spiral lamps tested gave off more UV than the 60 watt incandescent lamp tested, but that the encapsulated (double envelope) CFLs emitted less UV radiation. At 30 cm distance, the recommended maximum daily exposure was attained between 3 hours and 6 hours, with little difference between the studied 60 Watt incandescent lamp and any bare-spiral CFL. The report states that the threshold limit values used represent otherwise healthy individuals who are not experiencing any hypersensitivity conditions or exposed to substances that increase UV sensitivity. Outdoor sunlight can supply the maximum recommended daily UV exposure in 20 to 100 minutes.

SCENIHR study and report

The Scientific Committee on Emerging and Newly Identified Health Risks (SCENIHR) in 2008 reviewed[18] the connections between artificial light and numerous human diseases, including:

Electromagnetic radiation risks

The World Health Organization’s IARC categorizes EMF and radiofrequency exposure as class 2B possibly carcinogenic.[20] Like other devices that are dependent on electricity for their functions, the electronic ballasts in fluorescent lamps emit electric and magnetic fields in the low-frequency range (the distribution frequency 50 Hz and possibly also harmonics thereof, e.g. 150 Hz, 250 Hz etc. in Europe). Some fluorescent bulbs emit high frequency fields (30-60 kHz).[21][22] Electric fields of this intensity have been associated with biological effects.[23] The effects of these can be reduced significantly by maintaining an appropriate distance from them.[24]

The Assessment of EM Exposure of Energy-Saving Bulbs & Possible Mitigation Strategies study has shown that worst-case exposure in bulbs tested is within the International Commission on Non-Ionizing Radiation Protection (ICNIRP) limits, the majority of which with large margins.[25]

The Seletun international scientific panel has called for all new CFLs to be fitted with filters,[26] since studies also show that CFLs conduct voltage transients and harmonics (“dirty electricity”) onto the wiring and that these can have biological effects, especially as regards diabetes[27] and cancers.[28]

Mercury

Fluorescent bulbs contain mercury, a toxic substance. The United States Environmental Protection Agency (EPA) provide safety guidelines for how to clear up a broken fluorescent bulb. Mercury can be harmful to children and developing fetuses, so children and pregnant women should avoid being in the area whilst a broken bulb is cleared up.[29]

Bulbs which have reached the end of their life should not be disposed of in normal trash, as this may release the mercury into the environment if the bulb is damaged. Several countries have specialised recycling or disposal systems for fluorescent bulbs, e.g. US bulb recycling.

According to the U.S. Environmental Protection Agency (EPA), the amount of mercury contained in a compact fluorescent lamp (CFL) is approximately 1% of the amount found in a single dental amalgam filling or old-style glass thermometer.[30] The U.S. EPA also states that using energy-efficient CFLs reduces demand for power, which reduces the amount of coal burned by power plants and hence reduces the amount of mercury emitted from coal fired power plants.[31]

Other conditions associated with fluorescent light

In rare cases individuals with solar urticaria (allergy to sunlight) can get a rash from fluorescent lighting.[32] Very photosensitive individuals with systemic lupus erythematosus may experience disease activity under artificial light. Standard acrylic diffusers over the fluorescent lamps absorb nearly all the UV-B radiation and appear to protect against this.[33]

One paper suggested that in rare cases, fluorescent lighting can also induce depersonalization and derealization, subsequently, it can worsen depersonalization disorder symptomology.[34]

The charity Migraine Action reported concerns from members that CFL bulbs can cause migraines,[35] and there are many anecdotal reports of such occurrences.[35][36][37]

References

  1. Kayumov, L; Lowe, A; Rahman, SA; Casper, RF; Shapiro, CM (2007). "Prevention of melatonin suppression by nocturnal lighting: relevance to cancer.". Eur J Cancer Prev. 16 (4): 357–62. doi:10.1097/01.cej.0000215622.59122.d4. PMID 17554209.
  2. , Shift Work, Light-at-Night and Melatonin, Breast Cancer Fund
  3. , DIN V 5031-100:2009-06 Optical radiation physics and illuminating engineering – Part 100: Non-visual effects of ocular light on human beings – Quantities, symbols and action spectra, DIN Deutsches Institut für Normung.
  4. , DIN SPEC 67600:2013-04 Biologically effective illumination - Design guidelines, DIN Deutsches Institut für Normung.
  5. "Working with Light Sensitivity".
  6. "Accommodation Ideas for Employees with Epilepsy".
  7. "Accommodation and Compliance Series: Employees with Lupus".
  8. Shadick NA, Phillips CB, Sangha O, et al. (December 1999). "Musculoskeletal and neurologic outcomes in patients with previously treated Lyme disease". Annals of Internal Medicine. 131 (12): 919–26. doi:10.7326/0003-4819-131-12-199912210-00003. PMID 10610642.
  9. "Accommodating People with Vertigo".
  10. http://www.ccohs.ca/oshanswers/ergonomics/lighting_flicker.html Lighting flicker, retrieved 2010 April 19
  11. Küller R, Laike T (1998). "The impact of flicker from fluorescent lighting on well-being, performance and physiological arousal". Ergonomics. 41 (4): 433–47. doi:10.1080/001401398186928. PMID 9557586.
  12. Veitch JA, McColl SL (1995). "Modulation of fluorescent light: flicker rate and light source effects on visual performance and visual comfort" (PDF). Light Res Tech. 27 (4): 243–256. doi:10.1177/14771535950270040301. Retrieved 2012-06-28.
  13. Colman RS, Frankel F, Ritvo E, Freeman BJ (1976). "The effects of fluorescent and incandescent illumination upon repetitive behaviors in autistic children". J Autism Child Schizophr. 6 (2): 157–62. doi:10.1007/BF01538059. PMID 989489.
  14. Turner M (1999). "Annotation: Repetitive behaviour in autism: a review of psychological research". J Child Psychol Psychiatry. 40 (6): 839–49. doi:10.1017/S0021963099004278. PMID 10509879.
  15. "Philips Tornado Asian Compact Fluorescent". Lamptech.co.uk. Retrieved 18 June 2013.
  16. "Emissions from compact fluorescent lights" (PDF). Health Protection Agency. 2008. Retrieved 2009-08-31.
  17. "Executive Summary: Report on Health Canada Survey of Ultraviolet Radiation and Electric and Magnetic Fields from Compact Fluorescent Lamps" (PDF). Canada. 2009-12-21. Retrieved 2016-06-15.
  18. "Light Sensitivity, Scientific Committee on Emerging and Newly Identified Health Risks" (PDF). Director-General for Health and Consumers, European Commission. 2008. pp. 26–27. Retrieved 2009-08-31. Although the carcinogenic UV dose from fluorescent lighting in offices is minor (~ 1%) when compared to equal exposure times in the summer sun, old risk assessments showed that actual annual exposures of office workers could increase by 10 to 30% from the fluorescent lighting, which over a lifetime was estimated to increase the risk of squamous cell carcinomas by around 4% with a baseline risk much lower than that for outdoor workers who dominate incidences (Lytle et al. 1992).
  19. Mattsson M-O; et al. (2012). "Health Effects of Artificial Light" (PDF). SCENIHR.
  20. Baan R, Grosse Y, Lauby-Secretan B, El Ghissassi F, Bouvard V, Benbrahim-Tallaa L, Guha N, Islami F, Galichet L, Straif K; WHO International Agency for Research on Cancer Monograph Working Group (2011). "Carcinogenicity of radiofrequency electromagnetic fields". Lancet Oncology. 12 (7): 624–626. doi:10.1016/S1470-2045(11)70147-4. PMID 21845765.
  21. http://ec.europa.eu/health/opinions/en/energy-saving-lamps/l-3/3-cfl-characteristics.htm
  22. Bakos J, Nagy N, Juhász P, Thuróczy G (2010). "Spot measurements of intermediate frequency electric fields in the vicinity of compact fluorescent lamps". Radiat Prot Dosimetry. 142 (2-4): 354–357. doi:10.1093/rpd/ncq276. PMID 20924120.
  23. Pavelka J, Jindrák L (2001). "Mechanism of the fluorescent light induced suppression of Curly phenotype in Drosophila melanogaster". Bioelectromagnetics. 22 (6): 371–383. doi:10.1002/bem.65. PMID 11536279.
  24. Kerr LN, Boivin WS, Boyd SM, Coletta JN (2001). "Measurement of radiated electromagnetic field levels before and after a changeover to energy-efficient lighting". Biomed Instrum Technol. 35 (2): 104–109. PMID 11383307.
  25. Nadakuduti J, Douglas M, Capstick M, Kuhn S, Benkler S, Kuster N (2010). "Assessment of EM Exposure of Energy-Saving Bulbs & Possible Mitigation Strategies" (PDF). Informat Technol in Society (Project BAG/08.004316/434.0001/-13 & BFE/15350).
  26. Fragopoulou A, Grigoriev Y, Johansson O, Margaritis LH, Morgan L, Richter E, Sage C (2010). "Scientific panel on electromagnetic field health risks: consensus points, recommendations, and rationales". Rev Environ Health. 25 (4): 307–311. PMID 21268443.
  27. Havas M (2008). "Dirty electricity elevates blood sugar among electrically sensitive diabetics and may explain brittle diabetes". Electromagn Biol Med. 27 (2): 135–146. doi:10.1080/15368370802072075. PMC 2557071Freely accessible. PMID 18568931.
  28. Milham S, Morgan LL (2008). "A new electromagnetic exposure metric: high frequency voltage transients associated with increased cancer incidence in teachers in a California school". Am J Ind Med. 51 (8): 579–586. doi:10.1002/ajim.20598. PMID 18512243.
  29. , US Environmental Protection Agency. Last updated on 12/29/2014. Retrieved on May 08, 2015.
  30. http://news.nationalgeographic.com/news/2007/05/070518-cfls-bulbs.html
  31. http://www2.epa.gov/cfl/what-are-connections-between-mercury-and-cfls
  32. Beattie PE, Dawe RS, Ibbotson SH, Ferguson J (2003). "Characteristics and prognosis of idiopathic solar urticaria: a cohort of 87 cases". Arch Dermatol. 139 (9): 1149–54. doi:10.1001/archderm.139.9.1149. PMID 12975156.
  33. Rihner M, McGrath H Jr (1992). "Fluorescent light photosensitivity in patients with systemic lupus erythematosus". Arthritis Rheum. 35 (8): 949–52. doi:10.1002/art.1780350816. PMID 1642660.
  34. Simeon D, Knutelska M, Nelson D, Guralnik O (2003). "Feeling unreal: a depersonalization disorder update of 117 cases". Journal of Clinical Psychiatry. 64 (9): 990–7. doi:10.4088/JCP.v64n0903. PMID 14628973.
  35. 1 2 "EU phases out low efficency (sic) light bulbs". Migraine Action. 2009. Retrieved 2009-09-04. However as reported regularly by Migraine Action, there are concerns - voiced by many members - that the new bulbs can cause migraines.
  36. "Low-energy bulbs 'cause migraine'". BBC. 2008-01-02. Retrieved 2009-09-04.
  37. "Phasing out 100W lightbulbs 'could damage health of Britons'". London: Daily Telegraph. 2009-08-31. Retrieved 2009-09-04.
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