365nm 和 395nm紫外線燈有什么區別

365 nm 和 395 nm紫外線燈的差異

365 nm 和 395 nm 選項都在 UV-A 波長范圍內。一般而言，UV-A紫外線燈可用于產生和觀察熒光效果，以及用于塑料和油漆固化。與更強的 UV-B 和 UV-C 射線相比，UV-A 波長更安全。

那么，30 nm 的差異意味著什么呢？

主要區別在于 395 nm LED 比 365 nm LED紫外線燈發出更多的可見光。395 nm LED紫外線燈發出明顯的紫色光，而 365 nm LED 發出暗淡的藍白色光（殘余光能“拖尾”進入可見光譜的結果）。兩種類型都在 UV-A 波長范圍內發射，并且通常能夠產生“黑光”或固化效果。

為什么可見光量有差異？

上圖顯示了 365 nm（窄虛線）和 395 nm（寬虛線）LED 的光譜輸出圖。您會注意到，365 nm 和 395 nm LED都在高于和低于各自波長的波長范圍內發射。換句話說，395 nm LED 不會僅在 395 nm 處發光。

395 nm LED 在 395 nm（由術語峰值波長定義）發射最強，但它也在 400 nm 甚至 410 nm 發射相當多的能量。這些波長固定在光譜的可見紫色部分。

當然，395 nm LED 也會發出低于 395 nm 的波長，這些波長的光能在產生熒光效應或引發 UV-A 反應方面非常有效。但是，如圖所示，重要的是要注意大部分光能是在可見的紫色區域發射的。

相反，查看 365 nm 光譜輸出，您會注意到幾乎所有的光能都僅在不可見的 UV-A 范圍內，發射能量在達到 400 nm 之前逐漸減少。與可見光能量相比，這將使 UV-A 能量的量更大化，并且對于大多數 UV-A 應用來說是優選的。

但是，當照亮 365 nm LED 時，您可能會注意到發出暗淡的藍白色光。這是由可見光“泄漏”引起的，其中也發射了微量但可見的可見波長能量（即白光）。這種可見光能量的比例非常小，以至于在光譜圖中顯示為“0”，但在某些應用中，例如紫外線攝影，可見光確實是可檢測到的，可能會令人討厭。在這種情況下，可能需要額外的可見光過濾技術。

365 nm 紫外線燈熒光比395nm紫外線燈強

除了具有不發射紫光的優點的 365 nm 紫外光外，許多物體在 365 nm 處會發出最強的熒光，如吸收光譜測量所證明的那樣。

結果是 365 nm 光可能更適合需要更強熒光效果的應用。再加上發出的可見紫光量較少的優勢，365 nm 光可以被認為是性能至關重要的更佳選擇。

上海路陽儀器有限公司提供多種款式的365nm led紫外線燈，詳情請撥打免費咨詢電話咨詢：4006-254-365，或微信掃描下方二維碼添加微信咨詢：

365 nm and 395 nm for UV-A Applications

Both 365 nm and 395 nm options are within the UV-A wavelength range. Generally speaking, UV-A lights are useful for creating and observing fluorescence effects, as well as for plastics and paint curing. UV-A wavelengths are safer when compared to stronger UV-B and UV-C rays.

What then, will a difference of 30 nm mean?

The main difference is that the 395 nm LED emits much more visible light than the 365 nm LED. The 395 nm LED emits a pronounced violet-colored light, while the 365 nm LED emits a dull, bluish-white light (the result of residual light energy that "tails" off into the visible spectrum). Both types emit in the UV-A wavelength range and are generally capable of producing "blacklight" or curing effects.

Why is there a difference in the amount of visible light? The chart above shows the spectral output diagram of both the 365 nm (narrow dotted line) and 395 nm (wide dotted line) LEDs. What you will notice is that both 365 nm and 395 nm LEDs emit over a range of wavelengths both above and below their respective wavelengths. In other words, 395 nm LEDs don't emit at only 395 nm.

The 395 nm LED emits strongest at 395 nm (as defined by the term peak wavelength), but it also emits quite a bit of energy at 400 nm, and even 410 nm. These wavelengths are solidly in the visible, violet portion of the spectrum.

Of course, the 395 nm LED also emits at wavelengths below 395 nm as well, and the light energy at these wavelengths are very effective at creating fluorescence effects or initiating UV-A reactions. But, as the chart shows, it is important to notice that a significant portion of the light energy is being emitted in the visible, violet region.

Conversely, looking at the 365 nm spectral output, you will notice that virtually all of the light energy is within the invisible UV-A range only, with emission energy tailing off before reaching 400 nm. This will maximize the amount of UV-A energy compared to visible light energy and is preferred for most UV-A applications.

When illuminating a 365 nm LED, however, you will likely notice a dull, bluish-white color emitted. This is caused by visible light "leakage" where minuscule but visible amounts of visible wavelength energy (i.e. white light) are also emitted. The proportion of this visible light energy is so small that it is shown as "0" in the spectral charts, but in some applications such as UV photography, the visible light is indeed detectable and may be a nuisance. In such cases, additional visible light filtering techniques may be necessary.

365 nm for Strongest Fluorescence

In addition to 365 nm UV lights having the advantage of not emitting violet light, many objects will fluoresce strongest at 365 nm, as evidenced by absorption spectrum measurements.

The result is that 365 nm light may be better suited for applications where stronger fluorescence effects are desired. Coupled with the advantage of having a lower amount of visible, violet light emitted, 365 nm light can considered an optimal choice where performance is of paramount importance.