I realized the UV flashlights I ordered wouldn't arrive in time for the experiment. I flash ordered the floodlight and it arrived in 3 days. (Thank you.) The quality far exceeded my expectations. It included a 6-ft cord, 3-prong plug and inline switch (not mentioned in the description). The lumen output was phenomenal. I have no instruments to measure it but we performed the experiment in a darkened room rather that the black-out space reserved. Buying this light was one of the best experiences of the Summer of COVID.
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