I think you're going to struggle. A lamp is a complex thing. Dissipating a huge amount of power passively isn't easy, let alone from something typical lamp sized. If you don't do it right, your light output will look bad, it will change as the LEDs warm up. The heatsink shapes can be complex too, they are not off-the-shelf parts. Take a look at some of the high-power lamps, especially the older ones which may need to dissipate a lot more heat as you will if you're using such a high powered LED module. It's why there was once a 10-million-dollar prize to produce a lamp that could replace a tungsten bulb, and only one entrant won (Philips).

That's a really nice module. I used MeanWell constant voltage modules (LPF) that for home lighting in my office. The voltage is dead-accurate (the one I tested was within 0.05V!) for long LED life, and there's no flicker, so it doesn't mess with camera either.

I have dissected a couple LED bulbs.

They have a buck switching power supply in the base to convert 120 V or 230V to DC.

The ones I checked are 5V.dc

You can get a buck switching power supply with an adjustable voltage and current output, adjust voltage and current. Commercial light bulbs buck power supplies are preset to volts and amps when they are designed.

I have a LED kitchen light that has 2 banks of ~ 100 smaller LEDs around the edge. The buck power supply inside was set higher, it was failed so I dont have the DC voltage output available to share.

For another example I took 115 VAC  LED floodlights that had a failed motion detector, and removed the LED floodlights.

I installed them on a robot that used a 12V battery.  The LEDs turned on at about 1.6 V   and varied brightness based on the current limit adjust.

The LEDs were rated for 2A, I adjusted the buck supply output voltage to .25V above turn on voltage, and current limit to 1 A  because the lights got hot to touch at higher current levels. 

Hi Gyula,

mit akarsz pontosan csinálni?

(What do you want really wanna do?)

Bridgelux DS122 Vero SE 18 Array Data Sheet 20180910 Rev J.pdf

A led tul nagy hogh it betenni a E27 lámpaban.

(The LED is to big for a E27 globe lamp.)

Es lehet as elektronik modul nagyon drága less.

(The electronic module can be very expensive.)

Servus

Gerald

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I think you are asking for the moon here !

The highest power E27 LED bulbs you can buy (easily) are rated at 10W.

You are not going to make a 42W part easily or simply.

You might manage it with a fan built in but it wont be small or look much like a bulb.

Just buy one of those cheapo LED floodlights and wire it up with a cable to E27 adaptor.

MK

I wrote the LED name, You can see the datasheet. So why write me without You saw?

Hi Gyula,

Everyone here is on their own time and giving you the best ideas that they have to offer. Sometimes an idea even a bad one can help a person to look at a problem from a new perspective. It is not likely that anyone can give you a recipe for exactly what you are looking for. That will take a lot of research on your part and likely a bit of compromise. We do not know what country you are from so we do not know what is available. This may be a result of the language barrier but your posts come across as demanding and impatient with the guys who are trying to help you. I hope you are able to figure out how to do what you want with the LED.

John