Note: Provide a real full name and legitimate email address. Sign up for our free newsletter and we'll email you a link to download the report. Get a FREE copy of the Best LED Lights for Exposure Units PDF report. Assuming you are using a photopolymer emulsion, high output LED lights should work well as a light source when you are building your exposure unit. LED light sources that have a high lumen output work best for exposing screens. Safe to use (they generate very little heat).As prices are becoming par with fluorescent lamps, LED lights are becoming more widely available.įor exposing exposing screens, LED lights have several distinct advantages: LED lights are becoming more and more popular and are becoming the lighting standard in USA. Using a photopolymer emulsion (compared to a diazo-based emulsion) when you have a low UV light source will make a huge difference toward success or failure when making a stencil. Photopolymer liquid emulsions (and photopolymer capillary film) work well even with poor light sources. Manufacturers developed photopolymer emulsion products because they know that many screen printers use an exposure light source that is less than ideal. It exposes very quickly and has a wide exposure time range. Photopolymer emulsion is very sensitive to light. If you think of emulsion (or capillary film) as the 'photographic film' used to make your stencil, think in terms of speed and light sensitivity. While the light source will determine what kind of art you can use to make a stencil, the type of emulsion or capillary film that you use is actually more important. As a result, you don't see them used as often.Īs we have written in a previous article on light sources for exposure units, most people who want to build their own exposure unit mistakenly think that the light source is the most important consideration. metal halide or mercury vapor lamps are more costly, not as easy to source, and more difficult to implement into a typical home-made exposure unit. On the other hand, a light source high in UV, e.g. This is why most low cost exposure units have them as a light source. But they have a low purchase price and are readily available. Fluorescent, halogen lights and most LED lights are low in ultra-violet (UV) light. The ideal light for screen exposures is one that is rich in ultra-violet (UV) light.
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