Hi Anandita, and welcome to The Tortoise Table! Congratulations on welcoming Truck (love the name!) into your family, and it sounds like you've made a brilliant start.
It's great that he is in a tortoise table and has a good heat/light and UVB bulb. Komodo tortoise eco terrain is fine for a substrate, but it's a bit expensive and you want a substrate that is 3" or 4" deep minimum, so that Truck can bury himself completely if he wants to. It might be cheaper to use a less expensive substrate, and most of us use a combination of ordinary screened topsoil and children's play sand, and you can buy bags of both at most garden centres, Homebase, etc., and you then mix them about 60% or 70% topsoil and the rest play sand But if you prefer the Komodo substrate that is fine.
I think your temperatures are a bit high, as what you are aiming for is around 30C directly under his heat bulb, and measured at the height of his shell -- not measured from a thermometer mounted on a nearby wall, as that will be quite a few degrees cooler than it is under the lamp. At the cool end you want a temperature of around 20C if possible, but of course on hot days, when the room itself is warmer, you can't really get a temperature as low as 20C (but it's what to aim for). As the days are warm now, the baths you are giving him are especially important, as small tortoises can dehydrate quickly under hot lights indoors, so it's a good idea to give him these soaks. If you are interested, I can recommend a type of thermometer with a probe that you can hang down so it sits under the bulb at the height of the tortoise's shell, and they aren't very expensive.
I don't think you have to worry about making a humid hide (but by all means do so if you want to), because the spraying you are doing should work just fine.
I'm not familiar with Komodo Nutri-Cal, but I just looked it up and it seems OK. Tortoises do need a lot of calcium to support all of that bone and shell, so I would also leave a cuttlefish bone in the table for him to nibble on when you're not dusting his food with the Nutri-Cal. Or you can buy food grade calcium carbonate powder of limestone flour (which is almost the same thing), and dust that on his food on days when you aren't giving the Nutri-Cal.
Yes, by all means put him outdoors in the garden, supervised -- he will love it, and the UVB from the sun is of a higher quality that the UVB we get from our lights. There are lots of ideas for building outdoor enclosures, but do remember to make it escape proof (tortoises are surprisingly good climbers and escape artists (see the photo attached).
I think that you are going to be an excellent tortoise keeper! You probably already have a care sheet, but in case you don't, here's a link to one:
https://www.tortoise-protection-group.o ... 014New.pdf
And here is a link to a really excellent website about Hermann's tortoises -- lots of information about subspecies, etc. It's based in the USA and some of the care advice is slightly different to what we practice here, but it's still really good:
https://www.hermannihaven.com/
It would be lovely to see a photo of young Truck (lol, we never tire of looking at photos of tortoises!).
Nina
[attachment=0]climbing tortoise.jpg[/attachment]
