Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
Read up on articles by Sanjay Joshi on this. The DE bulbs are slightly more efficient but after you add a UV shield to it, the PAR value is similar to SE bulbs. In addition, if you use an HQI ballast, they tend to OVERDRIVE the DE bulbs. So they definetly burn can brighter but burn out quicker.