Honestly I don't think either of these are a great solution, but I do believe that Glasshouse is underwhelming. As you said, everyone just reenters the bubble to refresh their bonus when it's out, so they only time Glasshouse is beneficial is giving an extra 5 seconds of bonus of you refresh right before the bubble disappears.
If it granted both Weapons and Blessing of Light, I think it would be overpowered, and would quickly become the only exotic used by Defenders. The most important choice a Defender has to make for their super is whether to run Weapons, Blessing or Armor, and eliminating that choice by providing them for you isn't the best idea.
As for doubling the bonus provided, that would just be insanely overpowered. If a Defender runs Illuminated, the bonus provided by Weapons/Blessing is +35% damage or shield. Doubling that to +70% would make the hardest PvE encounters feel trivial, and would make PvP teams with one or two Defender Titans incredibly hard to beat if they were well coordinated with their bubble usage.
I think the best way to make Glasshouse more viable is to have it provide the perk Illuminated for you, so you're always getting the extra damage/shield, and are able to pick a different perk from that tree.
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This is a good idea I just hope they do something with the helmet
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As do I. At least it looks cool. :P
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Great comment! Exactly what I was thinking.