I'm gonna disagree with this to some extent unless "something like" includes Roc strikes, which is where it will have the most valuable use for me by far. The Saint 14 blind isn't as useful there as it is in many other situations (and that will still be my default defender piece).the glasshouse is cool, but it only extends WoL/BoL by 5 seconds. i think its handy in something like the Atheon fight where 5 more seconds of WoL can make a big difference but it would be difficult to justify its use in other situations (especially when you re-dip into the bubble) over helm of saint 14/ruin wings
But a Weapons of Light Defender is kind of the core of almost any fireteam because it benefits the full team shooting at a boss- and while the 5 seconds of extra buffed damage per popping in the bubble might not seem like it at all, the small amounts time spent dipping back into the bubble each time adds up to a significant boost to DPS throughout a whole fight. When these fights are ideally < 3 mins to begin with, it's less subtle a difference than you might think. In otherwise low-risk scenarios where just doing as much damage as quickly as possible is the most you need to concern yourself with (Roc strikes) it's pretty perfect. I'm psyched

Of the two, Obsidian Mind is far more build-defining though of course. I'm really pumped for this as I've just started to come around on Voidwalkers and am loving Shatter/Angry Magic.