I can't speak about energy efficiency or longevity, but I can say that these lamps produce bright white light, which is exactly what I wanted. They replaced the halogen bulbs. Perfect fit - cooler - whiter light which is what I wanted. Installed without a dimmer. Just on or off and when it's light. With such an item either thumbs up or thumbs down; it's a thumbs up - no regrets. I recommend this product.
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