You could but it might not last long Infact you might be better using parallel resistors for a single LED.
LEDs are semiconductors and as such do not obey Ohm's law. Wired in parallel what will happen is that ONE of the devices will 'tip' over into forward conduction. LED's have very very low forward resistance once conducting. This has the effect of leaving all the rest of the parallel devices unlit.
Parallel resistors are only necessary if you cannot find resistors with a high enough current rating and have to make up your own 'network'.
I doubt they'd work in series for the simple reason that you'd have to force every single one into forward bias before any current would flow.
As you say, 1 resistor per LED is good (and commonly acknowledged) practice to avoid cascade failures.
It is possible that the semiconductor mkrs have started incorporating series connected current limiting devices (resistors) within the LED package itself. WHich makes things a whole lot easier if you just want drop in replacement lighting.
I doubt they've included reistors in the package because they'd foul up the current if you had to add your own if you had to work with different voltages.
Eh? The voltage between an LED leads is 2-5V usually depending on type(and roughly colour).But would it mess with the current? If a forward biased LED has virtually zero resistance (which it does) then anything in series will appear as a current limiting device. The applied voltage is of no consequence. The LED will exhibit a anode/cathode voltage differential between 0.7 and 1.0 volts.
Ah so lucky! we got a van der graff generator which we were assured would make our hair stand on end if anyone ever got it working!We had a play with Tesla coils in physics and it was extremely f***in' dangerous.
Health and Safety wasn't so prevalent in the early 1980s