I bought these bulbs along with the "Feit 100 watt Dimmable Led bulbs 4 pack" (https://www.amazon.com/100-watt-Dimmable-bulbs-pack/dp/B01MFGH6EQ) and the following is my comparison of both.BRIGHTNESS AND POWER USE:According to the specs, Feit bulbs produce 100 more lumens while using only half a watt more than the Philips bulbs, so at least on paper they are more efficient (Feit bulbs use 15 watts to produce 1600 lumens, while Philips use 14.5 watts to produce 1500 lumens). In experience, at least one part (the "lumenage") of the spec comparison is true - Feit bulbs are brighter than the Philips ones, although, in addition to the extra 100 lumens Feit bulbs put out, it might have to do with the fact that Feit bulbs are 3000K CRI rated, which has a lighter/brighter/whiter tone of light, in comparison with Philips bulbs' 2700k rating, which has a more yellow quality of light, which I started really disliking after seeing the pleasant tone of 3000k bulbs. The other part of the spec comparison - wattage consumed - would require specialized equipment to test, which I do not have, but after replacing at least 12 incadescent bulbs with Feit LEDs, our electrical bill went down at least 50%. I imagine the same would happen if Philips were used. But if you prefer more brightness over half a watt saving, Feit is the clear winner. Using half a watt non-stop over a 24 hour, 365 day period, comes out to 4.38kWh/year (24*365*.5). If your electricity costs you 50 cents a kWh (and that's the high end of the range), that's $2.20 per year. Spend a buck more per year, and save your eyesight - you won't even spend that much unless you use that extra half a watt 24/365. Just remember - Feit bulbs are more efficient per watt (producing 1600 lms at 15 watts, versus Philip's 1500 lms @ 14.5 watts)!LIFE & WARRANTY:According to the product descriptions, Feit bulbs will last 15,000 hours, while Philips will last 11,000 hours. For Feit, 13.7 years based on 3 hrs/day, equals to 13.7*365*3. For Philips, 10 years based on 3 hrs/day, equals to 10*365*3.Feit offers a 5-year free-replacement warranty, while Philips offers a 3-year warranty. In addition - and I haven't checked that on my own - according to a lot of reviews on the Philips bulbs, the extra 5-year warranty Philips offers if you register the product on their website, is invalid, because the website does not recognize the model number, so the point is moot.Feit wins on both counts!PRICE:In terms of price, Feit bulbs also win, being at least a dollar less expensive per bulb (compare 4 for $16 vs 8 for $40).DIMMABLE OR NOT:Although I haven't tested this, the product descriptions say that Feit bulbs are dimmable, while Philips bulbs are not. Feit takes this one too!SIZE:Feit bulbs are larger than Philips, with the Feit bulbs having an A21 shape compared to Philips' smaller A19 shape, so if whatever fixture you use has a size constraint, you might want to double check what size bulbs your fixture can accommodate. On the flip side, your fixture might call for a longer bulb due to its structure (such as recessed ceiling lights) to spread out the light across the space more evenly. This has nothing to do with the size of the socket where you actually screw the bulbs in, as both Feit and Philips have the same medium E26 base (base is the threaded, metal part of the bulb which gets screwed into the socket). Size is the only aspect on which Feit and Philips come to a draw!I've also attached 2 photos of both being side to side for comparison, along with the specs visibly printed on the sides of the bulbs.Overall, Feit bulbs win hands down!Thanks for reading!