I got my hands on an old slide projector (the kind that projects cel slides onto a wall).
The light source, is a 24V, 150W incandescent halogen lamp.
As a little pet project, I'm thinking of converting this projector to LED, using a high power LED. To do that, I need to remove the lamp mirrors, replace the existing lens with a reflector and collimator lens, add a heatsink, etc.
But before even attempting this, I need to know how much light I need.
I've used a conversion table to estimate the number of lumens that I need. My estimation is between 3.6klm to 5250lm (I've used "tungsten quartz halogen (12–24 V)" and "photographic and projection lamps", I don't really know which one is applicable in my case).
Only once I know how much light I need, I can deduce what kind of high-power LED I need.
- I have no experience in photometry as such, is using Lumens as a comparison value even applicable?
- Are my estimations correct?
I was looking at getting a 100W LED, which supposedly provides 10klm, and then add a PWM controller to dim it, if necessary. But it seems that a 100W LED is pretty overkill to me.