The brightness of a light bulb is measured in lumens, which refers to the amount of light output. The more lumens a light bulb provides, the brighter the light. In the past, wattage was used to evaluate the brightness of a bulb, but with the evolution of LED technology, lower wattages can provide the same amount of lumens as higher wattages. Therefore, the brightest light bulb is not necessarily the one with the highest wattage.

Based on the search results, here are some of the brightest light bulbs available:

• ENERGETIC SMARTER LIGHTING 150 Watt LED Light Bulb, Super Bright A21 Daylight 5000K, Non-Dimmable, 2300lm, High Lumen Light Bulbs, UL Listed, 2-Pack
• 400 watt Titan HO LED hanging light, which is the brightest hanging light available with 57000 lumens and a 90 degree lens standard
• 300 watt Aries 3 E39 LED Light Bulb, which is the brightest light bulb made with almost 40,000 lumens and a high efficiency of 138 lumen/watt

Its important to note that the brightness of a light bulb can also be affected by the color temperature, measured in Kelvin (K), which can range from yellowish to bluish white light.