60 Mm Led Down light: Second Version

I had so reported already in the first version, that I am been written at about a reader’s letter, to construct a 60 mm recessed. Now, I shall build a better version of the recessed lamp that is visually appealing and emits more light.

Short and brief wiedermal halogen spots should be replaced by 25 W fitted in approximately 3 m above sea level in a concrete ceiling. The problem remains the same: the hole in the concrete ceiling has only a diameter of 55 mm and cannot be expanded. There is no standard solutions on LEDs here as before. So has to be constructed again something yourself and as always with high efficiency.

Here Requirements:

  • Boost output at about 800 lumens
  • Installation in a 55 mm diameter concrete ceiling hole
  • 230 V
  • If possible close angle
  • Light color warm white

The LED

The previously used CREE can be used still MK-R. The cause of the problem is just that I must increase the current, which in turn leads to a higher heat output. Here must be so grow the heat sink and an appropriate driver for the increased power are found.

What heat sink and driver?

For this project I have driven further at the same time another project parallel, where a M K R LED installed is also, which is operated with about 1,05 A. This matching cooling body was so found. Now also the bulb socket to connect to the heat sink, I just picked my heat conductive adhesive and glued the heat sink with the lamp socket. Looks really not bad! What is missing now is the suitable drivers.

Actually, I thought that it should be pretty easy to find a suitable driver. Just after a 10 W 12 V driver search and I think it’s actually. Pandey! What it says must be not necessarily in it. This is apparently not only at e bay LEDs so, but also when drivers from China. I ordered that a total of 4 pieces and only one of the 4 could provide my approx. 1 A. To be precise, there are 880 m A. Well, not really 1 A but at least close to it. The others were: 300 m A, 450 m A and 500 m A.

A Look That Should Be Visually Beautiful

Now returned to the clip-on lens used, which had proven themselves on various projects as a lens. However, the client wanted a lens that emits little backwards, so I took the lens and with a silver foil glued them. Although expensive, but works! Finally I took from him acrylic glass lens sent to one me and glued over the lens pasted by me. I have now been a beautiful radiation downward, as well as a little diffused light to the sides.

Admittedly, stylish looks already! Now it just has to work. So, I’ve connected everything electric and even run 4 hours at a time. Although the temperature of the LED was slightly higher than my other projects, but still within the tolerance zone. The temperature of the heat sink was approximately at 65 ° C and that of the estimated 80-85 ° C LED

The Light of the Second Version

MK-R in the warm white copy came Yes as I mentioned to use a CREE. According to the data sheet, the LED has a C R I value of 90. So much like a halogen lamp following Listofledlights. A comparison with my 50 W has also confirmed halogen lamp on the ceiling. The entire lamp has blasted off a nice uniform light me a desired beam in the middle. So I liked it! I’m curious now only on the conclusion of the Blog lesers, whether he sees it as well as I.

Gallery

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