SLA printing uses laser light to cure resin in a bath to generate 3D parts, one layer at a time. The finished parts are smooth, with finer detail than what can be accomplished using (Fused Deposition Modeling), which extrudes plastic that is deposited in layers to build a part on a build platform. However, SLA printed parts require post processing to make them usable, even for model creation. Each part required excess uncured resin to be cleaned away, usually in an alcohol bath. Further, to eliminate surface stickiness and improve overall strength, it is necessary to use light cure conditioning to complete the curing of the finished model.

For desktop printer owners, the search for an economical post-process light cure solution leads to low-cost solutions. One such solution is to purchase tape light strips. These are inexpensive and operate from simple low voltage power supplies. They can be purchased from e-bay for a few dollars, and proclaim high-efficiency and violet light. Most use a standard mid/low power 5050 LED package and deliver anywhere from 395 to 410nm of violet light.  Another approach, which we have attempted, is use of 5mm LEDs in arrays on a simple custom circuit board.

Before I go any further, I will state now that after extensive testing and experimentation attempting to discover a super-low cost light cure conditioning solution, none of the low-end, low power Read the rest of this entry »


Follow your passion and success will follow you

I find these “inspirational” vivications irritating and shallow. At the risk of being pedantic, allow me to explain.

In this case, the words evoke images of everyone loving what they do, and succeeding for it – with the inference of success pointing  to fame and fortune. Certainly, if you look at successful people in the public eye; actors, musicians, athletes, motor sports champions, internet and social media innovators, software developers, wealthy investors, etc…, they Read the rest of this entry »




Money does not buy happiness.

We’ve heard it before, and it is a compelling sentiment. Unfortunately, it is all too easy to assume that the basic needs of sustenance, shelter, security and comfort are a given. These cost money. Without food, protection from the elements, security from harm, and a modest degree of comfort, even a basic level of happiness is not possible. We live in a world Read the rest of this entry »


The ubiquitous Dazor Desk lamp. There has to be millions of these still in use. But, there is only one that can do what this one does!

Task lighting is a passion, so that means gathering my share of collected old-timer fixtures that are iconic, or representations of a product that is familiar and comfortable. In this case it is the Dazor desk lamp. I have these in drafting board mount, and have made on floor lamp from a similar foundation. I don’t use fluorescent tubes in any of them, and Read the rest of this entry »

thumb-meterFor those who attend my presentation on Metering and Meter use at the LED Specifier Summit this Tuesday (9:00AM) here is the related reference information and a copy of handouts for the presentation. Let me know what you think and post your comments or questions here. If you have any questions or wish to discuss this presentation or have a metering issue you’d like some help with, let me know.

Here is a copy of the presentation handout here: LED Spec Summit KLW Meter Presentation

The following are a summary of the links to the meter files content referred to in the presentation:

Meter Review

Flicker Wheel

Flicker Meter Review

LQC Classification Article

LQC Workbook

Color Viewer


On a Personal Note

Posted: November 10, 2016 in General Commentary

My trusted and most valued tool – a resto-modded 1967 South Bend tool room lathe with all the fixings

My joy in life is in making things. In this, there is rarely a day that passes where I am not building something or tinkering a gadget together. Yesterday it was  drill fixture to aid a co-worker in drilling 30 brackets in less than a half hour, while protecting fingers from the part jumping around. It was 20 minutes a work and a few scraps of metal, job done – smile on face. Otherwise, it’s a light fixture for the conference table, a test rig for a cure light, a finger brace for a kids broken finger, an adapter to convert an old fluorescent task light to a UV cure light/500Fc detail work light combination. Read the rest of this entry »

15339-11575-151222-ceiling-3-lIn September, Elizabeth Donoff or Architectural Lighting wrote an Op Ed titled “Who “Owns” Lighting Design?”. It was a well written exploration of the topic. She pointed to one specific example, a ceiling that Apple now uses in its retail outlets, which it has patented extensively. She uses this as a case for questioning where the line of authorship and/or ownership of a technical solution is, and who owns the end product. the ultimate question is of who owns authorship?  I get the point, and have been confronted with it my entire Read the rest of this entry »