Sun Protection Factor

Ahem, masih urusan lanjutan dari per-muka-an nih hehehe..

Kalo selama ini taunya spf 15 itu lebih ringan/gak kuat menahan sinar matahari daripada spf 35, nah baru tau nih kalo itu salah.

Jadi, bukan urusan kuat ato ga kuat, yang bener itu 1 spf tahan untuk 10 menit. yg artinya, kalo spf 15 itu dikali 10 menit, berarti tahan 150 menit (2,5 jam aja), berarti kalo udah dipake 2,5 jam, taro lagi deh sunblocknya. kalo gue, krn pemalas, kayanya spf 50 aja deh, cukup buat 500 menit, nggg berjam-jam, emang sih gak kena matahari terus, palingan pas makan siang aja, cuma emang dasar gue gak tipe yg touch-up make-up ya.. rempong hihi.

Minggu lalu sempet nyantronin Kiehl's lagi *doyan* dijelasin nih sama mbak2 jaganya, kaya dapet pencerahan kalo emang kudu harus pake sunblock, mana dia meuni canggih pisan pengetahuannya ngasitau arti 1 spf itu apa, gue googling, mendarat di http://www.wisegeek.com/, kira2 gini penjelasan versi geeky-nya:

SPF is an acronym for Sun Protection Factor. The number you see associated with SPF represents the length of time you can stay out in the sun without burning, multiplied by the corresponding number. So a person who would normally start to burn in 10 minutes, could theoretically have 150 minutes of sun protection with a sunscreen that has an SPF of 15.
Regardless of SPF number, testing of sunscreen does not really correspond to the amount of time you can stay out in the sun without burning because sweating, clothing rubbing against the skin, and water sports will all wear the sunscreen off. Tests also use much more sunscreen than do most people, so SPF number results can be inaccurate. Usually, an SPF 15 rated sunscreen will give your about an hour of protection before you should reapply sunscreen. This, of course, varies from person to person. It also helps to wear protective clothing, hats and sunglasses.

The SPF number only relates to ultraviolet B (UVB) protection. Ultraviolet A (UVA) protection is not measured through SPF numbers, and until recently, frequently was not available in sunscreens. UVB rays are more potent, quicker to produce sunburn, and have been linked to skin cancer. UVA is associated with aging of the skin, and along with UVB exposure, may increase risk or facilitate skin cancer. UVA though milder, is still not safe.

Some chemicals found in new sunscreens that also boast an SPF number can help block UVA rays. Chemicals like Parsol 1789 block both UVA and UVB rays. Unfortunately, these chemicals are a cause of concern to environmentalists because they have been found in water, groundwater and soil. Potential long-term effects of exposure are unknown.

What remains important to remember is that SPF strength is less important than frequent application, and avoidance of sun between 10 am and 4 pm, when UVB rays are strongest. SPF protection should always be combined with protective clothing and sun avoidance during the hottest and brightest parts of the day.
Some people do pay more for higher SPF protection, and this may make sense for those with lighter skin. Doctors generally recommend purchasing an SPF sunscreen of 15 or higher. There are lower ones, which will cause the skin to tan or burn in under an hour. It may be unnecessary to purchase an SPF higher than 15, except possibly for infants, if you can be vigilant about reapplying the sunscreen every hour, and after swimming or very vigorous physical activity.

Kesemsem sihh sama sunblock-nya Kiehl's soalnya gak creamy, namun nampaknya sudah terlalu banyak krim2 mihil yg kubeli akhir2 ini yak, lagian udah keburu pesen sama sohibku si puspus, jadinya sekarang lagi pake Neutrogena ajah, 100 ribu hepi ^o^

Seneng karena biasanya kalo spf 50 itu tebel blenyek2 kan? nah ini gak sama sekaliii... nyoss lsg reseup :)

Cobalah.. cobalah... :D