Need a 0-10v controller for my NextLight Mega Pro ...

I think most are 10v, so should be interchangeable.

Good options that work: GrowFlux Universal Dimmer (+ RJ adapter) Plug-and-play 0–10 V dimmer that can schedule, sunrise/sunset, and run up to ~50 fixtures. GrowFlux specifically documents NextLight units with RJ45 control ports and shows the pinout. Use their small RJ adapter cable to go from the dimmer to the Mega Pro’s RJ port. TrolMaster Hydro-X (HCS series) + LMA-14 lighting adapter Full environment controller that also does 0–10 V lighting control; the LMA-14 adapter is designed for “lights with 0–10 V protocol” and TrolMaster lists NextLight among compatible LED brands. Great if you want automation beyond dimming. Simple 0–10 V wall dimmer (Leviton / Lutron, etc.) If you just want a knob: a standard 0–10 V dimmer (violet = +, gray/pink = −) will vary intensity; no timers or ramping. Leviton’s docs cover wiring and color codes for 0–10 V. You’d use an RJ-to-pigtail lead (or the GrowFlux RJ adapter) to land the two control wires. (Optional) NextLight Adapt Pro If you can still find it in stock, this little box was made to bridge NextLight Pro Series fixtures (including Mega Pro) to most third-party 0–10 V controllers. It’s not required if you go straight into the fixture’s 0–10 V pins, but it can simplify the hookup. Hookup tips (important): Set the fixture to external control: On the Mega Pro, toggle the onboard dimmer to EXT so it listens to the 0–10 V line. This is in the Mega Pro user manual. Use the RJ control port: Mega Pro Pro-series lights expose 0–10 V on an RJ45 jack and allow daisy-chain. If you’re not using a controller with an RJ output, use an RJ-to-pigtail adapter and land the two dimming wires (+/−). Polarity matters: 0–10 V “+” to violet, “−” to gray/pink on most dimmers; reverse will either not dim or behave oddly. Hope that helps 😘

Looks like a dimmer built into a driver, so which is actually broken? if you can open it up and patch in a new "dimmer" that's cheap to replace and should be simple to rewire. Are you certain the driver portion is fine? (rhetorical)

This is the exact reason I sold my electric sky ex300 v3 the second they went out of business.

https://www.walmart.ca/en/ip/DC-0-10V-Dimmer-Switch-Seriesable-Sync-Controller-Rotary-ON-Off-Drivers/1G3IHRI0U8W7

DKARDU 2 pcs DC 0/1-10V Knob LED Dimmer Mini Controller Rotary Switch PWM Dimming with knob Cap for 0/1-10V Dimmable LED Drivers Controling Interior Light Grow Lamp. Found that on Amazon for 10 dollar should do trick but I do not condone the use without a certified electrician ;) that's a expensive light over 1000 dollar. Beautiful. Best of luck.

0-10v dimmer switch controller is a standard piece of equipment. Replacing a 0-10V controller is generally straightforward, when selecting a replacement, ensure it is compatible .If you are unsure use electrician.