Recent content by avalon11

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    Building ultra high CRI floodlights using 50W or 100W COB's

    Only now noticed seller specifying 90 CRI what is low for advanced technology. Lamp should have adquate cooling for LED to last long. It needs to be mounted on tripod but single screw attachement should be good. Mains of course. Angle - flexible and ability to adjust is ideal. Here's working...
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    Building ultra high CRI floodlights using 50W or 100W COB's

    Hello. I want to build ultra high CRI LED lamps but have trouble finding ready and easier to build lamps for artistic work. I discovered on Aliexpress very rare type LED's that actually use 405nm emmiterr or more phosphors to ensure full visible spectrum coverage at better price. Problem is even...
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    UV transparent binders for glow in dark paint?

    Hello. Just received glow in dark powders and now I'm wondering what kind of binder would best suit to make paint. I plan to paint in UV LED light so 365nm-395nm UV light binder that transmits and is resistant UV is necessary. Binder barrier of course going to be thin so little UV absorbtion...
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    Brightest red and blue glow in dark pigments?

    Yes, there isnt big and bright selection of orange/red pigments. Mainly these are zinc and calcium sulfide but in alibaba seller mentioned red (CaSr)S:Eu that degrades fast and has smell.
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    365NM 385NM 395NM or 405nm best for fluorescence?

    I tested again 365nm lamp it can produce strong fluorescence in dyed cleaners, cotton fibers, paper or certain colored packages with only some white light but I really feel that I need to filter it out. Was that filter good quality from alibaba and didn't block UV? Can you give link? I tried...
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    365NM 385NM 395NM or 405nm best for fluorescence?

    Yes, good quality UV LED lamps also have dichroic or Wood's glass filter to remove visible light. Problem is that they are also expensive. Where I can get cheaper filter?
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    365NM 385NM 395NM or 405nm best for fluorescence?

    I want to find UV LED‘s that produces not only strong but also wide range of fluorescence. I have built own lamp using Ebay 3W 365nm LED‘s expecting to get best quality clean UV light and was somewhat dissapointed. They do produce strong fluorescense of cellulose and phosphor based materials but...
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    Difference between 365nm and 375nm UV lights?

    I got from Ebay 365nm UV LED's and made powerful torch out of 14 of them. They do produce UV but also somewhat white fluorescence. When compared with blacklight tube 365nm seems more like white LED because there is so little fluorescence. I mean range of it, phosphors and cellulose do glow...
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    Which part of spectrum activates glow in the dark?

    365nm produce cleanest fluorescence since it contains little violet light but still LED's may emmit white fluorescence. I tested them with blacklight tube and was dissapointed to see low fluorescence range, only cellulose and phosphors glow brightly. Club lights use cheap 405nm.
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    Brightest red and blue glow in dark pigments?

    Hello. I want to buy red, green and blue glow in dark pigments to make paint. Problem is that there are brightly glowing green pigments such strontium alluminate or more expensive with europium coating. But I have hard time finding bright red or at least redish orange glow powders. Usual green...
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    Flashbang flashlight for selfdefence?

    There are lots of effordable powerful 18650 flashlights but it's hard to find powerful pocket flashlights that can be carried anywhere. Don't know there isn't still electronic flashbang devices for selfdefence, they great make nonlethal weapon even attackers with guns. There are even tactical...
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    Flashbang flashlight for selfdefence?

    Anybody heard about compact flashlights with blinding flash? I researched best legal pocket selfdefence weapons and powerful flashlights looked promising especially intergrated with kubotans, pepper sprays or tasers. But I couldn't find flashlight that would feature high powered flash which...
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    Homemade UVB lamp for vitamin D?

    UVC is indeed harmful and damages DNA that's why it's effective at killing germs. But if I'm correct UVC is completely blocked by air and ozone, since even few centimeter barrier of ozone gas with PE film seems stop UVC judging from no smell of it. In Soviet Union germicidal UVC lamps where also...
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    Homemade UVB lamp for vitamin D?

    Hello, I want make UVB lamp for vitamin D production since vitamin D supplement are not only less effective but also more expensive. Regular tan lamps produce only 1% UVB and too much useless, harmful UVA. UVB narrowband, 311nm or also called lamps for skin diseases are more effective but every...
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