" is not clear for me if is better utilize LEDS or light "
Scroll right down to the first answer to your query and you will see that Graham 93 already listed the advantages of LEDs over incandescent lamps (bulbs).
"can I use in the same group led and lights? "
If you mean the 6V bulbs that you have from Krick, and working on a 6V battery, then yes.
BUT; remember each bulb will draw 50mA from your battery (checked on the Krick website), this is more then twice what most LEDs will draw. E.g. 10 bulbs draw 500mA, 10 LEDs draw ~250mA.
Also consider that your bulbs are less efficient; more heat is produced with bulbs than light for each watt consumed. At 6V your bulbs consume 300mW (6x50/1000).
Approx 60% (at least) of that goes as heat, i.e. ~180mW, max 120W light.
In contrast, 'standard' 3mm or 5mm LEDs are approx 90+% efficient.
(Not forgetting the power lost in the dropping resistor! V=IxR, P=IxV 😉)
LEDs waste much less power as heat and live much much longer.
I have a long term test running of an LED illuminated polar bear, so far 10 years (87,600 hours) with no failures😀 Far exceeding the manufacture's spec of 10,000 hours😀
But since you already have the Krick 6V bulbs ...!
BTW Back in the days before cheap multi-colour LEDs were available to modellers I used clear (white) bulbs but coloured them as required (red, green, yellow) with glass paint available from craft shops.
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