Product Overview The Explore Scientific Astro R-Lite is a red LED flashlight made for use at the telescope. It runs on a single AA battery, weighs 2.7 oz, and has an aluminium body specified as resistant to drops and weather. A sliding control adjusts beam intensity, and the light offers high, low and flashing modes. A pocket clip is built into the body and a neck strap is supplied. The reason for red light rather than white is physiological. Rod cells in the retina handle low-light vision and take twenty to thirty minutes to reach full dark adaptation, and they are far less sensitive to long-wavelength red than to blue or white. A dim red beam lets you read a star chart, find an eyepiece or check a focuser without resetting the adaptation you spent half an hour building. The intensity slider is the feature that matters most in practice. A red light that is too bright still costs adaptation, so being able to run it at the lowest usable level rather than a fixed output is what makes a red torch genuinely useful under a dark sky. Who It's For Visual observers at dark sites: reading charts, changing eyepieces and finding dropped caps without undoing your dark adaptation. Astrophotographers: cable routing, filter changes and focuser adjustments in the dark, with a flashing mode available as a marker. Star party attendees: a red beam at low intensity keeps you on good terms with everyone else on the field. Anyone setting up and tearing down in the dark: the pocket clip and neck strap keep it where a hand can find it rather than in the grass. Observers who travel light: 2.7 oz on a single AA is a small addition to a case or a pocket. Key Features & Design Red LED illumination, chosen for the wavelength range that preserves rod-cell dark adaptation. Sliding intensity control: continuous adjustment rather than fixed steps, so the beam can be dialled to the lowest level that does the job. High, low and flashing modes, covering close work, chart reading and signalling. Aluminium body specified by Explore Scientific as resistant to drops and weather. Single AA battery — a cell available anywhere, which matters more on a trip than a proprietary pack. 2.7 oz published weight, light enough to hang from a neck strap all night without noticing it. Built-in pocket clip and supplied neck strap for keeping it to hand in the dark. Recommended Uses Reading printed star charts and planispheres at the eyepiece. Changing eyepieces, filters and diagonals without losing dark adaptation. Setting up and packing down a telescope after dark. Night photography and astrophotography work around the rig. Camping, night walks and general after-dark use where preserved night vision is an advantage. Compatibility and Accessory Notes Battery: one AA cell. Explore Scientific supplies the flashlight with its pocket clip and neck strap; the battery is a separate purchase, and we can add one to the order. Carrying: the pocket clip suits a shirt or jacket pocket and the neck strap keeps the light accessible with both hands free at the telescope. Use alongside optics: the light is independent of the telescope, so it works with any instrument — refractor, reflector, catadioptric, binocular or camera rig. Star party etiquette: the low setting is the one to use on a shared field, and the intensity slider makes that a single movement. Weather: Explore Scientific describes the aluminium body as weather resistant. They do not publish an IP rating, so no figure is quoted here. Good to Know Before You Order The AA battery is sold separately. Explore Scientific's published package covers the flashlight, its built-in clip and the neck strap. We can include a cell with the order so it is ready the night it arrives. Explore Scientific does not publish a lumen output, beam distance, runtime or IP rating for this light, so those rows read as not published below rather than carrying an estimate. If one of them decides the purchase for you, ask and we will put the question to our Explore Scientific rep. Red light preserves night vision but changes how colours read. Printed charts using red ink can wash out under a red beam, which is why most astronomical charts are printed in black on white for exactly this reason. Body dimensions are not published, only the 2.7 oz weight, so the physical size row is absent rather than estimated. We can measure a unit for you before it ships if that matters. Even red light costs adaptation if it is bright enough. Running it on the low setting is what keeps the benefit intact, and the sliding control is there to make that easy. Frequently Asked Questions Is it difficult to set up? No — a single AA battery goes in and it is ready. The intensity slider and the mode control are both operated one-handed, with nothing to configure. Why red rather than white? The rod cells that carry low-light vision are much less sensitive to long-wavelength red than to white or blue light, so a red beam lets you see what you are doing without resetting the twenty to thirty minutes of dark adaptation you have built up. Does it come with a battery? The AA cell is a separate item. We can add one to your order so the light works the moment it arrives. How bright is it? Explore Scientific does not publish a lumen figure, so no number is quoted here. What they do specify is a sliding intensity control plus high, low and flashing modes, which is the practical answer — the output is adjustable rather than fixed. Can I use it for anything besides astronomy? Yes. Camping, night hiking, wildlife watching and any situation where preserving night vision is useful all suit a dimmable red light. Will it survive being dropped on a field? Explore Scientific specifies the aluminium body as resistant to drops and weather, which is what an observing field asks of a torch. Bottom Line In short: a 2.7 oz aluminium red LED flashlight running on one AA cell, with a sliding intensity control, high, low and flashing modes, a built-in pocket clip and a neck strap — the small piece of kit that keeps a dark-adapted eye dark adapted. If you would like a battery included so it is ready to use on arrival, add a note to your order and we will take care of it.
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