Posts Tagged ‘LED retrofit lamps’


My first LED lamp - Almost too easy


The light pattern worked surprisingly well considering the Frankenstein nature of the lamp.

In the process of retrofitting lighting into new and existing designs, I come across particularly problematic situations that no products on the market seem to exist. The most recent was a single head pedant I needed a light source with a light pattern somewhere between an old R20 spot and a PAR20 Flood, at around the R20 flood light output. The fixture was designed around the R20 and its soft beam.

I tried a couple commercial R20 LED products, and found them all to be too harsh and splashy, and too narrow in distribution. So, I figured, how hard can this be? I was impatient and tired of buying stuff that don’t work…

Igor! gather me up some parts!


This test was accomplished using a Testo 540 light meter, under continuous operation. The lamp is a Lights of America model number 2004LEDDL-35K-24 purchased at Walmart for $16, using a cluster of 60 5mm LEDs on a plastic enclosure with an Edison socket. The approximate scale of the product is a long R20 lamp configuration – although the length to the illuminated tip of the lamp is far too long resulting in a portion of the lighted elements projecting from the trim of a regular downlight. The initial light output at the beam center is approximately equal to a 45W R20 Flood lamp at 549 candelas. However, this drops off very quickly, (more…)


These are typical low end retrofit lamps using clusters of 5mm or similar LEDs, often accompanied by outrageous claims.

This is where we run into the same trouble that plagues the CFL market in the consumer segment.

There are so many of these on the market today that it’s impossible to review every one of them. These are the ubiquitous 5mm LED retrofit cluster lamps. Since they all have similar performance, this review is a generalized summary, and an expression of concern.

In each case, the claims made by manufacturers of products such as this are founded on the connected wattage of the devices and not on actual lumen-to-lumen, or photometric equivalency (more…)