I switched from another mesh system to eero for precisely this reason; I don't have as many Lifx bulbs as you (I only have 10) but I have about 40 devices connected at any given time to the network, and it's working fine.  Before eero, my Lifx bulbs were disconnecting all the time, but since I've set it up, they have been rock solid.

For anyone looking for solutions to LIFX issues, I can confirm that using eero for wifi greatly solves issues. 

I have a home in Palm Springs with (at present) 50 LIFX lights. While the system worked OK in the early days of LIFX firmware (when the bulbs used a "mesh" architecture to communicate with each other and controlling apps), a firmware update which abandoned that approach left my lights uncontrollable via wifi.  

I've been infuriated with LIFX about this as controlling the lights via their cloud worked acceptably (that is, if I had my phone, for example, on LTE rather than wifi, commands sent to the lights via the cloud worked fine -- and with no perceivable latency over local wifi control). The obvious solution from LIFX would be to let you set your local LIFX installation to relay control changes to the cloud rather than having than managed locally. BUT, they've not implemented that. 

SO, I had tried things such as adding Airport Express routers to try and support this large number of devices which the Ubee wifi router from TWC/Spectrum we have here could not handle. Such solutions did not work. 

Installing eero fixed that (with a couple of small caveats - read on). My lights are now discovered in the LIFX app relatively quickly and all seem controllable. 

Caveats:

* Onboarding or resetting lights can be difficult on iPhone because (1) LIFX communicate only on 2.4 GhZ (2) since iOS AND eero have no way of assigning a device to only 2.4 Ghz SO, you may get into a situation where you cannot properly connect a new light (or a light that you have reset/need to reconfigure) in LIFX app. My workaround (an unpleasant one) is to use my Windows laptop for such tasks as I can tell my laptop's wifi adapter to prefer 2.4 band. 

(EERO, PLEASE ADD BAND STEERING!!! It's actually essential for s**t like this... c'mon, bro.)

* When ALL lights are on, the LIFX app can still get rather slow and I've seen it seemingly not enumerate all lights, even though eero shows them all being connected to the network. (There are occasionally a light or two at random that seem not controllable in the app.)  

That's likely not eero's  fault.  There's definitely still some flakiness in LIFX app in terms of handling large installations  (and the people at LIFX seem somehow gobsmacked that anybody would have more than a couple of their lights installed -- seriously, WTF, you morons... but I digress). 

YMMV as in all things, but eero seems to go a long way toward realizing the potential of LIFX.

Best Regards,

Keith