In that case, maybe just a better space heater? Like a 1500W one, that’s a much better value than you’ll get out of a grow light in my opinion. I’ve used this one for the better part of a decade, not for shrooms, but it’s kept me warm and also hasn’t burst into flames: https://www.amazon.com/dp/B087YRL86Q
Be sure to buy a tip-over lock, here’s the one I got on Amazon for a great price.
There’s plenty of them though, I sorta just bought the first safe one I saw lol