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Impression:Very Satisfied,UV;

Pros: Very powerfull, suitable for UV curable materials (photolitography, PCB etc). Best power/price ratio. Cons: None found. Othe thoughts: As UV LED, it produces some visible violet light. Can't be compared to "black light", it's not pure UV-A emmiter. Gets hot very quickly, needs heatsink. For... Pros: Very powerfull, suitable for UV curable materials (photolitography, PCB etc). Best power/price ratio. Cons: None found. Othe thoughts: As UV LED, it produces some visible violet light. Can't be compared to "black light", it's not pure UV-A emmiter. Gets hot very quickly, needs heatsink. For photolitograophy, it's safer than hi pressure mercury lamp and has greater efficiency than black light". For sterilization, hi (or lo) pressure mercury lamp is better, but you have to protect your eyes! Mercury lamps produces ozone (toxic)! Czech: Slusny vykon za bezva cenu, idealni na osvitovou jednotku, spektrum zahrnuje viditelne i neviditelne (UV-A) svetlo. Nevhodne pro germicidni ucely. Read more

Impression:неочень;

Не является ультрафиолетовым светодиодом! Минимальный ультрафиолетовый диапазон UVA 315—400 nm. Это просто мощный 3W, 410nm синий/пурпурный светодиод приближенный к УФ спектру. Может использоваться исключительно для декоративной подсветки (отлично играет на белом, кислотно-зеленом, оранжевом Не в... Не является ультрафиолетовым светодиодом! Минимальный ультрафиолетовый диапазон UVA 315—400 nm. Это просто мощный 3W, 410nm синий/пурпурный светодиод приближенный к УФ спектру. Может использоваться исключительно для декоративной подсветки (отлично играет на белом, кислотно-зеленом, оранжевом цветах). Не может использоваться в качестве детектора фальшивых денег (практически не видит ультрафиолетовые знаки на рублях, долларах, евро). Лишь на рублях видит ворсинки. Read more

Impression:UV;

Pros: - you need just a few of those to light a small room with UV - works fine, and if you don't overstress it you can use it without a heatsink. Though a heatsink is always good to have - it's truly in UV spectrum, not just a little like other products

Impression:Very Satisfied;

Pros: Very cheap, good quality, useful for DIY and spare parts. Cons: Not at all Other thoughts: For DIY assemblies, you should pay attention to the metal plate in the bottom of this piece. It has to have a good thermal coupling to the heat sink.

Althought the eye is about 1/2% as sensitive for this color as for the same amount of green light, the fluorescent effect using only one of these leds is remarkable and can be brought to spotlight with the proper secondairy optics , so you can build a powerfol coolant detector for the garage and... Althought the eye is about 1/2% as sensitive for this color as for the same amount of green light, the fluorescent effect using only one of these leds is remarkable and can be brought to spotlight with the proper secondairy optics , so you can build a powerfol coolant detector for the garage and other functions like markings made of fluorescent paint, human fluids etc. These leds are much brighter than you think, because the sensitive for nthis color is almost zero. Never the less they can (when collimated and close distance irritate your eyes, the pupilmof your eye does not work correctly withy this color and opens them wide wich can damage the retina like lasers do To make an array gives you a very powerfulle Blacklight, even stronger than 400 Watt high pressure mercury dichargebulbs with only 10 of these leds!! With perfect cooling 3 Watts are no problem , without cooling 0.3 Watts is about the limit. Used in completely dark circumstances they can irritat your eyes so better build them in a WF 501b and correct driver like I did my shelve. For blacklighteffects and for laboratory instruments , these leds are very convenient. Use a correct driver and use coolnig grease , mount them on a thick aluminum plate and , when used many, use a blower, the cooler they run the mure invisable blacklight you get, as almost any colorled, the wavelength depends on the temperature of the ledcristal. When they become hot, the wavelenght goes to 410 nM , whenn cool is stayes below 400nM what is much less visable. Read more