Debris
LightNews LightNews
banner
docfuran.bsky.social
Debris
@docfuran.bsky.social
250 followers 740 following 320 posts
Working on a book about the Greek myths to process family trauma and living in a dying empire.

Still finding joy where I can!
Posts Replies Media Videos
Reposted by Debris
mtsw.bsky.social
seems like an easy fix for the US to just adopt the sensible EU regs! bsky.app/profile/bubb...
bubbaprog.xyz Timothy Burke @bubbaprog.xyz · 8d
again, this is a Europe regulations vs U.S. regulations thing! there are a total of five pages discussing the different beam strength at different wavelengths in the european standard, whereas the DOT says headlights must be "white."
Requirements for LED modules and Road Illumination Devices (except cornering lamps) including LED modules and/or LED light sources 1. General requirements for LED modules 1.1. Each LED module sample submitted shall conform to the relevant requirements of this Regulation when tested with the supplied electronic light source control-gear(s), if any. 1.2. LED module(s) shall be so designed as to be and to remain in good working order when in normal use. They shall moreover exhibit no fault in design or manufacture. A LED module shall be considered to have failed if any one of its LEDs has failed. 1.3. LED module(s) shall be tamperproof. 1.4. The design of removable LED module(s) shall be such that: 1.4.1. When the LED module is removed and replaced by another module provided by the applicant and bearing the same light source module identification code, the photometric requirements of the headlamp or AFS system shall be met; 1.4.2. LED modules with different light source module identification codes within the same lamp housing shall not be interchangeable. 2. Manufacture of LED modules 2.1. The LED(s) on the LED module shall be equipped with suitable fixation elements. 2.2. The fixation elements shall be strong and firmly secured to the LED(s) and the LED module. 3. Test conditions 3.1. Application 3.1.1. All samples shall be tested as specified in paragraph 4. 3.1.2. The kind of light sources on a LED module shall be light-emitting diodes (LED) as defined in paragraph 2.7.1. of UN Regulation 48 in particular with regard to the element of visible radiation. Other kinds of light sources are not permitted. 3.2. Operating conditions 3.2.1. LED module operating conditions All samples shall be tested under the conditions as specified in paragraph 4.6.4. of this Regulation. If not specified differently in this Annex LED modules shall be tested inside the device as submitted by the manufacturer. 3.2.2. LED light source operating conditions All samples shall be tested under the conditions as specified in paragraph 4.6.3. of this Regulation. 3.2.3. Ambient temperature For the measurement of electrical and photometric characteristics, the device shall be operated in a dry and still atmosphere at an ambient temperature of 23 °C ± 5 °C. 3.3. Ageing Upon the request of the applicant the LED module shall be operated for 15 h and cooled down to ambient temperature before starting the tests as specified in this Regulation. 4. Specific requirements and tests 4.1. Colour rendering 4.1.1. Red content In addition to provisions as described in paragraph 4.16. of this Regulation. The minimum red content of the light of a LED module or a device incorporating LED module(s) tested (at 50 V for headlamps and AFS) shall be such that: 0.05 E ( ) V( ) d E ( ) V( ) d k 780 n m 380 n m e 780 n m 610 n m e red             where: Ee() (unit: W) is the spectral distribution of the irradiance; V() (unit: 1) is the spectral luminous efficiency; () (unit: nm) is the wavelength. This value shall be calculated using intervals of one nanometre. 4.2. UV-radiation The UV-radiation of a low-UV-type LED module shall be such that: 10 W / lm k E ( ) V( ) d E ( ) S( ) d k 5 780n m 380n m m e 400n m 250n m e UV              where: S() (unit: 1) is the spectral weighting function; km = 683 lm/W is the maximum value of the luminous efficacy of radiation. (For definitions of the other symbols see paragraph 4.1.1.). 43.1.3. 43.1.4. 43.1.5. 5.1. 5.2. Calculate the ratio between the photometric test point value determined in paragraph 4.3.1.1. and the point value determined in paragraph 4.3.1.2. Once stability of photometry has been achieved, apply the ratio calculated above to each of the remainder of the test points to create a new photometric table that describes the complete photometry based on one minute of operation. The luminous intensity values, measured after one minute and after photometric stability has occurred, shall comply with the minimum and maximum requirements. Colour The colour of the light emitted measured after one minute and measured after photometric stability has been obtained, as described in paragraph 4.3.1.2., shall both be within the required colour boundaries. The measurement of the objective luminous flux of LED module(s) producing the principal passing-beam shall be carried out as follows: The LED module(s) shall be in the configuration as described in the technical specification as defined in paragraph 3.1.3. of this Regulation. Optical elements (secondary optics) shall be removed by the Technical Service at the request of the applicant by the use of tools. This procedure and the conditions during the measurements as described below shall be described in the test report. One module of each type shall be submitted by the applicant with the light source control gear, if applicable, and sufficient instructions. Suitable thermal management (e.g. heat sink) may be provided, to simulate similar thermal conditions as in the corresponding headlamp or AFS application. Before the test each LED module shall be aged at least for seventy-two hours under the same conditions as in the corresponding headlamp application. In the case of use of an integrating sphere, the sphere shall have a minimum diameter of one meter, and at least ten times the maximum dimension of the LED module, whichever is the largest. The flux measurements can also be performed by integration using a goniophotometer. The prescriptions in CIE - Publication 84 - 1989, regarding the room temperature, positioning, etc., shall be taken into consideration. The LED module shall be burned in for approximately one hour in the closed sphere or goniophotometer. The flux shall be measured after stability has occurred, as explained in paragraph 4.3.1.2. LOWER BEAM HEADLIGHTS NUMBER AND COLOR: White, of a headlighting system listed in Table II
November 25, 2025 at 12:32 AM
Reposted by Debris
mtsw.bsky.social
yes it's not the LED tech per se that's the problem (though LEDs have enabled headlights to appear in blue hues which is problematic for light pollution reasons) bsky.app/profile/bubb...
bubbaprog.xyz Timothy Burke @bubbaprog.xyz · 8d
the problem isn't LED lights, though, it's DOT having far less strict standards for beam pattern & glare than Europe (whose regulations are followed by much of the rest of the world). The allowed height of the lamps and the allowed height of the beam is much lower in the ECE standard.
The ECE R149, formerly ECE R112 regulation, applies to Europe, Australia, and parts of Asia. ECE-approved headlights are indicated by an “E-Mark.” This mark ensures that the headlight meets the European Standards for headlight lighting. Unlike DOT, ECE-compliant headlights have adaptive lighting options and a sharper cutoff. Key Compliance Factors for ECE R112-Certified LED Headlights ¢ Strict Beam Cuttoff Angles: It reduces glare, which can affect pedestrians and drivers. + Adaptive Lighting Features: It supports automatic dimming and road adjustments. ECE-approved headlights pass beam cutoff testing for precise light distribution. Vehicles equipped with adaptive LED headlights undergo dynamic lighting response tests. These tests make the headlights project light well. Many countries in the world have adopted ECE regulations. They follow these guidelines to meet global standards for headlight lighting.
November 25, 2025 at 12:18 AM
Reposted by Debris
aidanmoher.com
Ideally we’d have car free cities, but let’s start with better headlights and smaller vehicles.
November 19, 2025 at 2:53 AM
Reposted by Debris
denniswatson.bsky.social
ACA was their plan. It was the Republican plan, copied from Romney in Massachusetts and expanded nationwide. The reason they have nothing is because the ACA is the most right-wing option that actually (sort of) works. They have no alternatives because they don’t like how any alternative works.
November 19, 2025 at 6:43 PM