should say somewhere. dont get a fixture before you know as different types need different ballasts. and is the socket much bigger than a regular bulb? if it isn't it is probably a sodium. and sodiums mean nothing to plants.
also, welcome to cannabis.com, enjoy your stay
llamaman666 Reviewed by llamaman666 on . Hi all just curious.. want to know what kind of bulb is this it says 250 watts I found it in one of my rental houses and if it is a good grow bulb where can i find a big enough socket that will burn it it won't fit into a grow shade i have. Rating: 5