energy-saving light bulb
21Biogas — Swamp gas redirects here. For the obsolete theory of emanations from swamps causing disease, see Miasma theory of disease. Pipes carrying biogas (foreground), natural gas and condensate …
22Glossary of environmental science — This is a glossary of environmental science.Environmental science is the study of interactions among physical, chemical, and biological components of the environment. Environmental science provides an integrated, quantitative, and… …
23Cannabis cultivation — Typical home grown organic sinsemilla bud compared to a cigarette pack. This article presents common techniques and facts regarding the cultivation of the flowering plant cannabis, primarily for the production and consumption of marijuana buds.… …
24List of characters in Time Squad — This is a list of characters, including historical figures, that appear in the animated television series Time Squad . Major characters * Beauregard Buck Tuddrussel (Rob Paulsen): A burly time cop in the peak of physical condition, Buck is less… …
25Coal — Sedimentary Rock Anthracite coal Composition Primary carbon Secondary hydrogen, sulfur …
26Security lighting — In the field of physical security, security lighting is often used as a preventative and corrective measure against intrusions or other criminal activity on a physical piece of property. Security lighting may be provided to aid in the detection… …
27Philips — For other uses, see Philips (disambiguation). Koninklijke Philips Electronics N.V. Type Naamloze vennootschap Traded as Euronext:  …
28Neodymium — praseodymium ← neodymium → promethium ↑ Nd ↓ U …
29Твердотельное освещение — Светодиодная лампа Твердотельное освещение (англ. solid state lighting (SSL) разновидность освещения, для которого в качестве источников света используются светодиоды (LED), органические светодиоды (OLED), или полимерные светодиоды (PLED) вместо… …
30Искусственные источники света — Искусственные источники света  технические устройства различной конструкции и различными способами преобразования энергии, основным назначением которых является получение светового излучения (как видимого, так и с различной длиной волны,… …
