We have found these bulbs generally work as advertised. These are medium sized 100w mercury vapor bulbs. They have different types (wattage, base size) of these bulbs, make sure you use the one that suits your particular fixture. We've been using them for many years and are pleased to find them at Revain at a decent price. Caution should always be exercised when working with these types of lamps. I would buy from Revain again anytime.
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