I have used the Vinyl Flat and have the Furutech (made by Orb). When I first got the Furu, I figured- go the limit 2.5 hours of heat- it did flatten some badly warped records, but caused other problems to crop up. I now adjust the heat duration to more closely match the weight of the record and severity of the warp, with far better results. (Shocker- this is what the manual instructs).
When I was using the Vinyl Flat, I used a gradual, incremental approach- 2.5 hours heat, long cool down. If that didn't do it, I would increase the heat cycle by a 1/2 hour. This worked pretty effectively, but was far more time consuming (admittedly at far lower cost that the Orb/Furutech).
I have no idea how much heat you'd want from a lamp, CZ. If I recall, Vinyl Flat suggested measuring the temp inside their pouch and considered 140F to be an appropriate temperature. That was in a heating pouch that was velcro sealed around the compression plates.