These 23 watt Philips bulbs are hands down the best compact fluorescent bulbs I've ever bought! What I like about them is that they turn on instantly with the flick of a switch, just like incandescent bulbs. They also seem to warm up to full brightness fairly quickly (within seconds) and the luminous intensity is identical to what incandescent bulbs look like. I found that with other CFLs the light output was a little warmer and dimmer than a 100 watt incandescent, typically turning on even dimmer after a few days and taking longer to warm up, not to mention the pack's annoying start-up lag. None of that was the case with these Philips lamps. Another thing I like about them is that they are shorter than other CFLs of this wattage so they fit better in my lights. I will definitely continue to buy them when needed.