From: Emanuel Berg via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>
To: help-gnu-emacs@gnu.org
Subject: lights.el, compute illumination [EMACS CLIMATE ACTION INITIATIVE]
Date: Wed, 13 Jan 2021 13:47:28 +0100 [thread overview]
Message-ID: <87v9c1rokf.fsf@zoho.eu> (raw)
;;; -*- lexical-binding: t -*-
;;;
;;; this file:
;;; http://user.it.uu.se/~embe8573/emacs-init/lights.el
;;; https://dataswamp.org/~incal/emacs-init/lights.el
;;;
;;; data:
;;; https://dataswamp.org/~incal/data/LIGHTS
(defun illumination-score (w lm)
(interactive "nW: \nnlm: ")
(let*((le (/ lm w 1.0))
(max 75) ; LED luminous efficacy (lm/W)
(min 15) ; incandescent ditto
(scale (- max min))
(score (* 100 (/ (- le min) scale)) ))
(format "%.0f%%" score) ))
(when nil
(illumination-score
(+ (* 2 1) (* 2 2.8) 8 7) ; 22.6 W
(+ (* 2 120) 500 525) ; 1265 lm
) ; 68%
)
Turns out (as you see) that my conapt, with 4 or 6 bulbs,
scores 68%!
--
underground experts united
http://user.it.uu.se/~embe8573
https://dataswamp.org/~incal
reply other threads:[~2021-01-13 12:47 UTC|newest]
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