I think I can help, I used to run the darkroom at London Hackspace, and now building my own at home!
This is the ‘official’ datasheet for the bulb you’ve got:
The colour temperature is 3330K which is probably the same for all enlarger lamps (mine has the same specs, although it runs at 15V, which is the first time I’ve seen that).
According to this https://www.any-lamp.co.uk/philips-6834fo-100w-gz6-35-12v the light output is 750 lumen.
You might be able to replace this with one of these lamps: https://www.any-lamp.co.uk/led-lights/led-spotlights/gu5-mr16-led-bulbs?replacer_for_lamp_power_range=50W+-+59W&light_color=39381&lumen=Medium+output
Some of them reach up to ~650 lumen, which I guess will only lengthen your exposure times by a bit. Possible downsides:
- LEDs might not have the exact same colour spectrum as an incandescent light bulb, which might mean you’ll need to tweak your filtering.
- Not sure if all of those LED will work with 12AC supply, they may need a 12DC transformer.
- You’ll lose a nice heat source for your cold darkroom
- You’re still stuck with a giant transformer power brick
My strategy has been to replace the power supply with a switching DC power supply like this: https://www.meanwell.co.uk/lrs-100-12.html
I’m then combining this with an Arduino and a relay to integrate the timer and power supply into one unit, which saves space results in less clutter. Happy to show you in more detail if you’re interested.
You could potentially find a way to replace it with LEDs, but you’d have to build something like a diffused lightbox that goes directly above the film - a bit like what the Intrepid people have done with the enlarger mod for their large format camera: https://intrepidcamera.co.uk/blog/introducing-the-intrepid-enlarger The challenge there would be to ensure you get a good diffusion with no bright or dark spots.
Anyway, good to meet a fellow film photographer! Let me know what enlarger you’ve got and what you’re interested in printing (colour? B&W? what film size?) and we can discuss more!