本研究的目的是想要瞭解發光二極體之紅光、綠光、藍光、黃光照射在皮膚上是否會對皮膚的膚色及細緻度產生影響,以及探討四種不同的LED光波照射皮膚後哪一種光波是改善最為明顯。 實驗利用發光二極體中的紅光、綠光、藍光、黃光,作為皮膚的刺激光波。以功率為3W 的LED630nm 紅光(中心波長629.6nm、半波寬14.0nm) 、525nm綠光(中心波長526.9 nm、半波寬36.25 nm) 、460nm藍光(中心波長460.6 nm、半波寬20.27 nm)、590nm黃光(中心波長559.9 nm、半波寬13.1 nm)進行連續三週之光照刺激,以受測者之右手背作為實驗區域,左手背作為對照區域,來探討經由紅光、綠光、藍光、黃光照射後兩區域手背皮膚膚質之差異情形。本實驗以半定量評估皮膚顏色、細緻度及主客觀之心理感受之問卷內容是採五等級之評量法,來判斷分析受測者皮膚照射LED之膚質改善情形。實驗結果發現如下: 1. 紅光發光二極體照射皮膚後,發現每ㄧ週都有明顯使膚色變白和膚質變細緻,且與其他三種光源比較後,還是以630nm紅光照射皮膚後皮膚改善最為最顯著並且有持續的效果。 2. 黃光照射皮膚後,皮膚變白及變細緻的效果與紅光相似,尤其是照射前兩週效果最為顯著,但沒有持續現象。 3. 綠光發光二極體照射皮膚,在照射第一、二週膚質有產生較細緻的效果,但膚色方面是不顯著的。 4. 藍光發光二極體照射皮膚後,只在照射後前兩週時有明顯變細,而膚色方面是不顯著的。
The effects of phototherapy on skin color and fineness were studies and compared to evaluate the difference using red, green, blue, and yellow LED lights. 3W LED light sources were used with red in 629.6nm (Full Width Half Maximum 14.0nm), green in 526.9nm ( 36.3nm), blue in 460.6nm ( 20.3nm), and yellow in 590.9nm ( 13.1nm) and a three-week continuous exposure on the right hand of the patients was conducted while the right hand was used as a comparison. Questionnaires of 5 grade assessment were used to evaluate the psychological felling of the skin quality improvement by the patient himself or by objective observers. The results show 1. the skin color is whiter and finer week by week using red light phototherapy compared with other three different LED lights. 2. the yellow light phototherapy can also improve the skin quality as the red light therapy but the effect is significant only in the early first and second weeks. 3. the green light phototherapy can improve the skin fineness in the first two weeks, but not significant in improving the skin color. 4. the blue light phototherapy can also improve the skin fineness, but the effect is significant after two-week irradiation. The improvement in skin color is also not as significant.