wattage equivalent and colour temperatures Ordinary Bulbs / CFL's This is a guide to the difference between the power output of an ordinary light bulb compared to the power output and brightness achievable when looking to convert to an energy saving or energy efficient light bulb. Some Megaman products have a different equivalent wattage output due to their extended life so be sure to check on each product's individual landing page where the exact difference is shown. Please note that this chart is not valid for LED wattage equivalents. Standard Wattage Energy Saving Equivalent 40 Watt = 7 Watt 50 Watt = 9 Watt 60 Watt = 11 Watt 70 Watt = 13 Watt 75 Watt = 15 Watt 90 Watt = 18 Watt 100 Watt = 20 Watt 110 Watt = 23 Watt 125 Watt = 25 Watt 150 Watt = 30 Watt The colour temperature of a compact fluorescent lamp, more commonly known as an energy saving light bulb or energy efficient light bulb, defines the colour output of the lamp itself. You will notice that each lamp has either a colour reference or figure with the letter K next to it. What does this mean? A traditional incandescent lamp will put out the equivilent to 2700K which is about as close as you can get to the yellowy glow of a normal light bulb. 2700 Kelvin Extra Warm White - Traditional light bulb 3000 Kelvin Warm White - slightly less yellow 3500 Kelvin White - sort of speaks for itself! 4000 Kelvin Cool White - losing the yellow and replacing it with a blue tinge 6000 - 6400 Kelvin Daylight. Fantastic for sufferers of SAD or people working in offices. It replicates a cold, blue daylight feel. We use them in the offices for ebulbshop.com which is why everyone here is so happy!! If you are confused the just drop Buzz Lightbulb a line: buzz@ebulbshop.com and ask away. We're always happy to help and make suggestions or offer advice.