Ordered 10 bulbs at a great price! I recently bought a lightbulb at the Big Box Store for $10 with a face value of 3000,000 (warm white). These lamps are rated at 3500K (bright white). Replaced/installed 9 out of 10 bulbs. No questions. Each bulb made a rattling noise when shaken slightly, but everything worked. The light output is much brighter than warm light lamps, but not bright enough to block out the fluorescent color spectrum of daylight lamps. Will definitely buy in bulk! The only downside is that these bulbs take a few minutes to reach their full brightness. Read the Sylvania data sheet for this lamp which states "Initial lumen output after 100 hours".
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