Alot more engineering than that involved! Probably cost prohivitive for a market that normally doesn't have a lot of money for upgrades that cannot afford new gear. I remember the old 1960's catalogues in retrofit kits so as to make a
incandescent Fresnels into a
halogen Fresnels - before the BTN came out. Can
LED be done... yes, somewhat easily but it's a question of having a 500w luminous output sufficient
node to start with. Yes such security or
wash lights are on the market now one could start with that might have the
power. So you buy the
fixture and remove the components, cut the
reflector down to fit and use its say 1" square
node. Or separate the
node from
reflector in only using it.
Believe the norm for
LED's is 120 degree beam spread, a lot of light now is not focused in the
Fresnel lens as per a
point source especially the closer you focus to it in giving a even beam at all focus points. That's the start - source of light efficiently matching up with the
lens. Next if going P-28s lamp
socket installation of assembly for easy retrofit, you have to engineer squaring what you do to the
lens and making it strong. Than given a normal
voltage of 24 or 12VDC for
LED have to include the wiring/electronics package somewhere remote or inside the light. heat sinks?
Encourage the invention of something one can afford and or perhaps someone will do it one day - the upgrade for Fresnels, but it's complex - such an idea. Recently took a street light and made it
RGB LED for a tour. Basically took a
fixture, mounted a 1/4" plate of aluminum and did like 28x strips of high output
RGB LED tape to the plate. Was it as bright as a normal street light - probably not. Remotely located was
power supply and
DMX encoder box almost as large as the light - one
PSU each light. Very expensive to fabricate and in parts.