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In the 1970s, 34-watt energy-saving F40T12 fluorescent lamps were intoroduced in the United States. In the 1980s, T8 32-watt lamps were introduced, [ 8 ] but unlike the T8 tubes introduced in Europe, these T8s are not retrofits and require new matching ballasts to drive them.
Most CFLs contain 3–5 mg per bulb, with the bulbs labeled "eco-friendly" containing as little as 1 mg. [81] [82] Because mercury is poisonous, even these small amounts are a concern for landfills and waste incinerators where the mercury from lamps may be released and contribute to air and water pollution.
Most people could be led to believe that a 6.5% lamp is stronger than a 5% lamp, while both lamps might have the same total UV output (or the 5% could even be stronger across the spectrum). As such, UVA vs UVB rating on lamps only tells you the relative amount of UV, making a 5% lamp really a lamp whose UV spectrum is 5% UVB and 95% UVA. [5]
12 v: 13 w ansi № 828| pw13w wp3.3×14.5-7 1 12 v: 13 w pc16w pu20d-1 1 12 v: 16 w ansi № 7010 pcr16w pu20d-7 1 12 v: 16 w red pw16w wp3.3×14.5-8 1 12 v: 16 w ansi № 7445 pwr16w wp3.3×14.5-10 1 12 v: 16 w red pwy16w wp3.3×14.5-9 1 12 v: 16 w amber, ansi № 7448 ps19w pg20-1 1 12 v: 19 w ansi № 5201 psy19w pg20-2 1 12 v: 19 w
100-watt incandescent blacklight bulb A blacklight may also be formed by simply using a UV filter coating such as Wood's glass on the envelope of a common incandescent bulb . This was the method that was used to create the very first blacklight sources.
The efficacy of fluorescent tubes ranges from about 16 lumens per watt for a 4 watt tube with an ordinary ballast to over 100 lumens per watt [51] with a modern electronic ballast, commonly averaging 50 to 67 lm/W overall. [52] Ballast loss can be about 25% of the lamp power with magnetic ballasts, and around 10% with electronic ballasts.
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