Thanks for the great information. Just one clarification- SED (Standard Erythema Dose) is different than MED (Minimal Erythema Dose). SED is commonly used in Europe to measure UV light and indicates a dose of 100 J/m2 (joules per square). The article indicates that 1 SED is equivalent to ~10 minutes of sun exposure at zenith in summertime in Denmark at 56 degrees latitude. It also points out that 1 SED in natural sunlight is less effective at raising Vitamin D levels than tanning lights because only half of the body is exposed.
A standard 20 minute session in a tanning bed is about 625 J/m2. So 1 SED (or 100 J/m2) would be just a bit more than 3 minutes (not 5 to 20 minutes). So basically, the subjects in this study were getting the equivalent of 3, 6, or 12 minutes a month. Over the course of six weeks of winter, that would be 18, 48, or 72 minutes.
Keep up the great work!
1 SED
Jeff 25 Dec, 2011 02:24
Oops! That last part should read, "So basically, the subjects in this study were getting the equivalent of 3, 6, or 12 minutes a month. Over the course of six weeks of winter, that would be 18, 36, or 72 minutes.
1 SED
Jeff 25 Dec, 2011 02:26
Let's try this one last time:-)
"So basically, the subjects in this study were getting the equivalent of 3, 6, or 12 minutes a month. Over the course of six months of winter, that would be 18, 36, or 72 minutes."
“One pill every two weeks fights diabetes, cancers, heart failure, and 18 other diseases.”
A standard 20 minute session in a tanning bed is about 625 J/m2. So 1 SED (or 100 J/m2) would be just a bit more than 3 minutes (not 5 to 20 minutes). So basically, the subjects in this study were getting the equivalent of 3, 6, or 12 minutes a month. Over the course of six weeks of winter, that would be 18, 48, or 72 minutes.
Keep up the great work!