Does the XP buff from Focused Light stack with Radiant Light?

In Destiny, completing a Weekly Nightfall Strike awards you a buff for the remainder of the week called "Radiant Light". Radiant Light increases all experience and reputation gained on the character that cleared the Nightfall Strike by 25% until the next Tuesday reset. Recently, there has been a promotion with Red Bull where you can earn an item (Focused Light), which increases experience gained by 50% for 30 minutes.
Do these experience bonuses stack? And, if so, do they stack multiplicative manner (e.g. 1.5 * 1.25 = 1.875) or additive manner (e.g. 0.5 + 0.25 + 1 = 1.75)?
Best Answer
The "Radiant Light" buff only increases xp gain for all activity's, minus the Raids of course. The "Focused Light" promotion will only increase the amount of xp you get, just like the Radiant Light buff. As for it stacking with Radiant Light, I think that it will be able to stack. With reputation, that only goes for vendors and I don't think that it will increase rep gain.
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