Headlight Relay Kits

I ordered a kit from my local dealership a month ago and it finally came in this past friday.
Upon opening the box there was a Dear Customer letter inside. It seems they substituted a Halogen Semi Sealed beam headlamp unit in place of a Sealed Beam headlight unit [Halogen?].
It also indicated in the instructions that the Halogen lamp will be very hot when turned on or just been turned off.

Should I be concerned on the headlight being switched from sealed to Halogen semi sealed? [heat generated]
No mention if the original sealed beam was Halogen.

Also, would there be an issue with the heat when installed in a 1970 Dart Swinger with the plastic headlight grille surround?

Thanks
It looks like a decent kit for the price. [$30.00]

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If I am understanding the letter, you went from the big halogen bulbs, to housings that will accept different globes (Halogen or other off the shelves). The note about temp sounds like it's in regards to changing the globes after use. Like the modern style headlights, the globes (small light emitting pieces you pop into the light housing) will absolutely be warm with use, but they're set inside the new bulb housing you recieved so that will be the plastic/materials exposed to the heat you're concerned about and not the bezels or grill plastics.
You should also have the metal dishes behind the headlights too unless you removed them for some reason.
If you're worried about current creating heat, the suggestions for increasing the wire sizes to feed the lights, coupled with relays, will alleviate that and make the lights shine brighter.
I like to swap out the plastic connector that goes on to the lights themselves, with ceramic ones instead and have also increased gauge wire size for the wires off the relays to the lights themselves. The ceramic is just a preference and the wire size increase in my case was to be able to use hi/lo simultaneously [specific to the lights I bought and their instructions, otherwise that will pop the original style headlights high or lo].
No matter what you do, the bulbs or globes you use will be hot to the touch after being on.
Hope that clarifies that letter a bit for you and the things you mentioned.