It was originally referred to the specific bulb characteristics only -- i.e. no more than 25 W. For that kind of power, the cooling should be adequate. Me doesn't think of passive one as a better option. So, the key was - for that kind of wattage and luminosity However it immediately became an object of criticism, one said it's not enough light, the other blame cooling. As if i was trying to sell this bulb to someone.
Burgman 650 '04 Exec black (too much a scoot)
Last true 400.
Suzuki DL1000. (gone but still most miles)