Positives: - A lot of light - I do not hear anything - Light since immediately - Light quality felt good Negatives: - Relatively large (about 1/3 longer compared to classic bulbs) - The distribution of light upwards is rather poor - Life only 15,000 h Unfortunately, Philips sold just the light division. If you look at the CorePro 15, it is clear that now also 100 Watt classic bulbs can be replaced by LED. So Technologically is not much, now it's all about the price .... Speaking of price; I can not buy from Amazon, as the competition for the lamps