Confirmed. Max FoL tick: 28,762!
That's a HoT of 345,144 over 12s.
This was 10man with 5 Druids and no raid buff synergy at all, no flask...I think I forgot to equip my relentless libram in fact too. Wore my T9 though for the 4pc. I'm not sure we logged tonight on WoL though because our raid leader is on vacation and he handles that generally. All in all though the numbers are cool, but it might not really be a HUGE throughput increase:
1) Lesser gear. In a couple months, you'll be sacrificing 19 item levels and optimal itemization (though 4pc T9 isn't bad as long as it's shoulders, helm and gloves as your first 3). Though you can now regem T9 specifically for this; +3% crit heal meta gem and spell power in every socket.
2) Flash of Light doesn't have 100% crit of course and you might end up wasting 2-3 potential HL casts while you try to get a crit.
If we go by my numbers previously posted and assign normalized values to each of our heals and their components on Dream Walker (assuming 1.3s Holy Light):
Holy Light = 10.0 = 7.7/sec
GoHL = 6.5 = 5.0/sec
Flash of Light = 4.0 = 4.0/sec
FoL HoT = 26.0 = 2.2/sec
FoL HoT 4pc = 52.0 = 4.4/sec
Now folding the components back into their base heals, GoHL into HL and the HoT into FoL (obviously assuming you only cast FoL once per 12s)
Holy Light = 12.7/sec
Flash of Light = 30.0/sec
FoL + 4pc = 56.0/sec
Critical strikes would multiply each by 1.5 of course. You can basically multiply all of these numbers by 1.25 if assuming 50% crit.
However, each second you spend spamming FoL (initial heal + 1 single HoT tick) is only worth 6.2 or 8.4 with 4pc. Holy Light becomes 16.5/sec while under Heroism.
Flash of Light may net you 30 healing units per second spent, but consider the added brain work, monitoring crits vs noncrits, requiring Sacred Shield etc etc.
Casting Sacred Shield and 2 FoLs in a row to try for a critical strike, then let's add an additional GCD while you begin casting the 3rd FoL and cancel once seeing the previous one was a crit = 4 seconds total spent babysitting the FoL mechanic. 6.2 healing units gained for one second while spamming non-crit FoLs and 60 healing units gained upon the FoL critical strike.
In these 4 seconds, you would have on average gained 63.5 healing units by spamming Holy Light (12.7 x 1.25 for crits) compared to 66.2 gained via Flash of Light.
Wearing 4pc changes the numbers to: 63.5 units by spamming HL and 120.4 via babysitting FoL.
During Heroism though we get 82.6 units spamming HL and the same 66.2/120.4 (depending on 4pc) via FoL.
This whole thing is pretty moot anyway since this fight isn't exactly a cockblock on normal or heroic difficulty. Just a fun encounter.