+1.
Only thing I found is some white LED are too bright; red LED can be brighter but will affect your night vision less.
Headlight is more vexatious ...
The only actual bulb replacement is also LED, as the standard bulb base is known as "BPF" - British Pre Focus. If you go for this option, there are a number of versions about, those that use them and like them recommend the one with eight small LED (in two rows of four) on each side.
However, the LED replacement bulb does not solve the standard headlamp's problems; both Lucas lens-reflector combinations that take BPF-base bulbs are also abysmal - neither focusses any bulb's light well - apparently the replacement LED makes the bike more visible to other road users ... because the extra light is scattered widely ...
Compounding the problem is there were originally two BPF lens-reflectors and bulbs - both interchangeable physically but not correctly:-
. 71-77 (i.e. on your bike originally) was a 516801 lens-reflector with a 370 bulb;
. before 71 was a 516798 lens-reflector with a 446 bulb;
. however, when spares were difficult in the late seventies and through the eighties, any combination could have been fitted, but wrong bulb in either lens-reflector is even worse for lighting up the road at night.
Curiously, from about mid 77 until 82, Lucas then supplied one of the best lens-reflector-bulb combinations for old Triumphs - the circular bulb base and lens-reflector known as "P45t". Unlike the BPF, the P45t lens-reflector focusses the bulb's light well,

the bulb is 45/40 (main/dip Watts) so suits the standard alternator output well, it connects to the harness with the common 3-spade ("H4") plug,, the P45t lens-reflector is a straight swap for a BPF.
However, while by all means search Ebay and similar for "triumph 99-7060" and "lucas 54522680" (the bulbs are still common new as the P45t was the international automotive standard for most of the 1970's, millions of vehicles worldwide were fitted with them), the Triumph owners that have them know all of the above well ...

The Wassell company that has the rights to use the "Lucas" branding choose to inflict the awful BPF lens-reflector on us new.
My preference is to use a modern lens-reflector that takes a "P43t"-base bulb (the bulb that locates with three radial tabs). Two things to watch with this option are:-
. the reflector angle - much shallower than a Lucas and it will push the warning lights out of the headlamp shell;
. possibly the bulb plug will hit the back of the shell.
Even if the plug does not hit the back of the shell, the most common one - wires straight from the spade terminals - should not be used as the shell bends the wires sharply. Say if you consider this option and I will supply more details of the better plugs.
The standard P43t bulb is 60 Watts main/55W dip; i.e. either filament draws more than one Amp extra compared to a BPF bulb; nevertheless, as long as you keep the engine rpm up, and switch to an LED pilot bulb when engine rpm must be low, it is possible the standard alternator can also keep the battery charged. Although I prefer to fit one of the later, more powerful, alternators.
Originally, it was/is more use in the UK:-
. We have always had a legal requirement known as "parking lights" - anything left on an unlit (no streetlights) public road at night must be lit; a motorcycle would normally be lit with the pilot/parking light at the front and the tail light at the rear.
. For a long time, all drivers/riders were discouraged from using headlights under streetlights at night - all vehicles using "sidelights", motorcycles and pedal cycles were easier to see, police patrolling on foot would stop vehicles using headlights. However, British police have not patrolled on foot for probably fifty years, most modern road users do not have any conception of consideration for others - aside, the latest edition of our Highway Code has introduced a definition of "vulnerable road users" (of course, motorcyclists have not been included ...

).
Today, replaced with a LED, ime the "pilot light" is excellent as a bright front marker light, both in daylight and under streetlights at night, while not drawing much power.

Following the recommendation of a poster on A.N. Other forum, I replace both the standard pilot bulb and its holder with
one of these, its Black wire connected to the lighting switch's terminal #6 and its Red wire connected to the bike's harness Red wires, the standard lighting switch turns off the pilot when the headlight is on and vice-versa.
If you consider Eagle Eye LED, the wire conductors are very thin - quite a length of each must be stripped then folded to make something that can be gripped by crimped spade (lighting switch) and bullet (harness Red wire connection) terminals; however, they have plenty of wire to practice with ...
Whatever you connect, avoid the common red, blue and yellow insulated terminals (the bullets are too large for the Lucas snap connectors). In the US,
British Wiring sells correct 1/4" (wide) spade terminals, their insulators, correct Lucas-matching 3/16" o.d. bullet terminals, snap connectors that can connect more than four wires.
Happy to help and it is what the forum is for.