I know it's a studio light but I gave my friend a pair, he put them in the chicken coop. It's been a month or more since he had his last egg. Within 72 hours he had 3 eggs, now he gets his usual amount. The girls are back at work. I've also found that it transfers your light to other phosphors and boosts the colors around you. This would be expected if they were used in photography to bring out true colors.
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