UV LED Blacklight, HouLight High Power 10W LED Black Light Floodlight IP65-Waterproof (85V-265V AC) for Blacklight Party Supplies, Neon Glow, Glow in The Dark, Birthdays, Blacklights, Curing

I purchased this UV light on August 8, 2019, and it is still serving me very well! I use it mainly to cure UV resins. 10 seconds to reach a level of hardness where it doesn't run and I can apply more (but still sticky). A couple of minutes to achieve maximum harness with no stickiness (though these timings probably depend on the resin formulation). It seems to take around twice as long as under the noon, Summer sun, which, for a hand-held lamp is pretty fast. Two things that would make it easier to use are: 1. a power switch. 2. a longer power cord.I like that it has a wide field of string UV light so I can cure large areas, and/or don't have to meticulously point the thing. The mounting bracket makes a good handle. It gets warm over time, but never too hot to touch or hold. To compensate for the lack of a power switch, I use one of those plug/socket modules with an inline switch. I plug that into the wall, or power strip, then I plug the lamp into that.This is a UVA light, so it will not cause minerals to glow that are sensitive to UVC, but some minerals DO glow under this lamp, for instance, Ruby, Fluorite, Kunzite, Yperite. Also, this lamp is great for "charging" glow-in-the-dark items, and will nicely light up blacklight posters, and anything sensitive to "blacklight".

I used to use the incandescent blacklight bulbs but recently switched to those LED blacklights. I mostly use them for small to medium rooms, typically a size of a two car garage (smaller than 200 square feet). Here is a list of blacklights which I bought from Amazon.1. The incandescent backlight bulb which is 70W, I used one bulb to light up a room, not efficient light and it looked weak, the wattage rating was honest but it became scorching hot after minutes of use and I stopped using it.2. The 18W UV blacklight bar was bought on Amazon from another seller, worked well but it had dishonest wattage rating (20% lower than advertised).3. HouLight 10W LED UV blacklight was highly efficient and works to my satisfaction and two would cover the area pretty well (maybe even one light would do). Good quality and measured wattage matched with advertisement. Not much heat during the use. Highly recommended.4. A very similar looking 10W LED blacklight I bought from a different brand. At first I thought it looked almost identical to my HouLight but after a very close look I realized the LED chips are smaller and the cable was much thinner, also the wattage rating was dishonest (10% lower). Overall a less quality light and not recommended.In summary I found it wildly common that LED lights on Amazon have dishonest wattage ratings, as layman usually don’t have the tools to discredit what was advertised, it is still rampant on Amazon and even more so with the high wattage LED lights. That’s why I bought the wattage meter to measure all of my LED lights in my house. By all means wattage isn’t the only virtue but roughly represents the output light for most common LEDs. Rule of thumb is that a 50W LED (blacklight or not) light is close to the size of a shoe box due to heat requirements and so on -- you get the idea. So I would not trust a cheap and small “high wattage” LED light (blacklight or not) as they cannot defy physics, I also will never buy from the same seller again if their LED lights have false ratings. Again for small to medium size rooms there is no need to go with big wattages anyways, as 10W-20W LEDs are typically adequate. With blacklights it’s kinda tricky since there isn’t much visual light (well, it’s UV). You would use them in the dark with fluorescent tapes and neon paint or similar things to decorate the space, the power of the light will then be revealed and the decorations will glow wildly even from a big distance away.

This really made the black light paint in my Halloween scene pop. I only gave it 4 stars because even though it made the scene really come to life by illuminating all of the paint it didn't do much as far as lighting up the scene itself (which I thought it would do) Once I added a green flood light to my witch shack, it really brought everything together. If you are looking to add light to a scene, this alone won't work, but it does a great job of reflecting any blacklight or glow in the dark paint. A must have for your Halloween scene.

I purchased the HouLight for an unconventional use, to remove the yellow-amber cast from vintage Thorium glass camera lenses. You see, many camera lenses manufactured from the late 1940’s until the late 1970’s used radioactive Thorium in some of the lens elements because of its refractive index properties. The radiation is a non-issue, the lenses are safe to use, however the radiation does cause a slow yellowing of the balsam used to glue the glass together. This yellowing throws the color balance off and makes focusing more difficult.The solution to Thorium yellowed lenses? UV light. Exposure to a strong, steady UV light source over hours to days normally clears almost all of the yellowing from affected lenses. Some people just set the lens on a sunny windowsill for months. Sun UV works, however it is slow and causes heat buildup in the lens which can cause lubricants to migrate into unwanted areas. Some use desk lamps known to produce a high amount of UV, however this is a slow process. I chose to try the 10 watt LED UV HouLight.The HouLight has a flat back housing and a flat glass lens, perfect for use to dose lenses with UV light. I set the light on a table then used a rubber fens hood as a spacer between the lens and the HouLight lens. Any 1/14 to 1 inch spacer which can hold the lens up without blocking the elements will work, but a rubber or metal lenshood is easy and effective. Open the aperture of the lens fully and set it on the UV light. Plus the light in and let it go for 8 to 10 hours, then check your lens to see how much the yellowing has reduced. If it is getting clearer, set the lens back on the opposite end and dose another 8-10 hours. Some lenses may take much longer. WARNING!! Do not sit there and stare at the UV light. UV rays cause eye damage, especially in close proximity to an intense source.