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Chuck Guzis wrote: But remember, the short-wave UV can harm your eyes fairly quickly. Catching a brief glimpse of it won't hurt you, but avoid looking at it any longer than that. Put it in an opaque container. I strongly recommend installing a switch that turns off the lamp when the container is opened. The closer the EPROM window is to the bulb, the faster it will erase. Experiment to find the necessary duration for the part to verify erased, then double the time to ensure a good margin. When the bits first read as erased, the charge of the floating gate is only slightly below the threshold, while you want it to be completely discharged. If you're in a hurry, it is also possible to use a Xenon or Krypton flash tube (provided that it is made from quartz class to not filter out the shortwave UV) to erase the EPROMs nearly instantaneously. Needless to say, this is even more potentially harmful to the eyes.