tnx disco
so the 17500 rating could be the shop's fault I guess...
that "popular" hps lumen chart (don't have it on hand) shows 15000 for an average 150w bulb afterall...
I live outside US, so I'm stuck to 15-20€ (25$!) bulbs from top brands (hydroshop's cash register rings in the background...) I get to avoid credit card and just drive 15 mins tho.
Anyways good to know sylvania is still worth - will use it for 1-2 cycles more then
For all I know, a digi operates brighter than a coil. Yeah, $25 is kinda high for a 150. I might keep em longer at that price. Might be worth getting a lumen meter to know the best time to change.
With a meter, you might find a certain brand lasts longer than others.