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Next: learn what makes a test honest
The forward testing guide shows how to check a rule on data it has not seen, which is the test a repainting signal fails.
What is included
- What it is, in plain words
- The formula or mechanism, with exact arithmetic
- How it hits grid, martingale and DCA bots
- A check you can run before you switch a bot on
Who it is for
- People who run or plan to run a trading bot
- Anyone reading a backtest or a bot sales page
- Readers who want the numbers, not the pitch
- Not advice, and not a signal service
Key facts
- Lux Algo is described here only as a type of product: a package of charting indicators that draw buy, sell or trend marks on a price chart, usually running inside a charting platform.
- An indicator is a calculation on past prices. It is not a bot. A bot also decides size, places orders, handles costs and stops. A signal on a chart is only one input.
- Some indicators repaint: a mark can move or vanish after it appears, so the history looks better than what you would have seen live. In a made-up example 15 of 20 redrawn signals won (75%) but only 10 as issued (50%) (calculated by us on 31 Oct 2026, exact).
- A signal that wins half the time with equal size on wins and losses has an expected result of +0.00R per trade. A cost of 0.1 R per trade makes that -0.10R (made-up, exact).
- A good-looking chart is not a test. See backtesting and forward testing. We do not sell or give signals.
What an indicator package is
An indicator takes past prices, and sometimes volume, and turns them into a line, a band, a shape or a mark on the chart. A package bundles several of these and often adds alerts. A trader reads the marks and decides what to do, or connects the alerts to something that places orders. The marks are the output of a formula. The formula is fixed by the author, and the settings you choose change what it draws.
Many of these products say what their marks are meant to show, such as trend direction, reversal areas or momentum. What a mark is called and what it is claimed to mean is marketing. What it does is arithmetic on prices, and you can check that. For how the common built-in indicators work, see trading indicators and TradingView indicators. Which platforms and markets a given package supports, and what it costs, are facts you must read on the vendor's current pages.
The general risks of indicator packages
Repainting
A repainting indicator changes marks that are already on the chart. The cause can be as simple as using the current, unfinished bar. While the bar is open, the mark can appear and disappear. When it closes the mark may stay or go. A chart of history shows only the marks that survived, so the past looks cleaner than the live experience. The test is to watch the live chart over several bars and record each mark as it first appears.
Fitted to the past
Default settings on a chart of past data can look good because the author chose them while looking at that data. That is overfitting. A setting that looks perfect on one asset and period often fails on the next.
Signals without a plan around them
An entry mark does not say where to exit, how much to risk or when to stop trading. Those are the parts that decide whether a strategy survives. A signal with no loss limit is half a rule.
Costs the chart does not show
A chart shows prices, not spread, commission or slippage. An indicator that signals often is most exposed. See slippage and spread.
Worked example: repainting and costs
Everything here is made up. First, repainting. An indicator draws 20 signals on a past chart. On the finished chart, 15 of them look like winners, a rate of 75 percent. A person watched the same indicator live and wrote down each signal the moment it first appeared. Some of those marks later moved or disappeared, and by that record only 10 of the 20 won, a rate of 50 percent.
| Record | Signals | Winners | Win rate |
|---|---|---|---|
| Redrawn history | 20 | 15 | 75% |
| As issued, live | 20 | 10 | 50% |
| Gap | 5 | 25 points |
Calculated by us on 31 Oct 2026, exact. Nothing in the arithmetic is wrong. The two records measure different things, and only the second is what a trader acting in real time would have had.
Now costs. Say the real win rate is 50 percent and a win gains 1 R while a loss loses 1 R, where R is the amount risked. The expected result per trade is 0.5 times 1 minus 0.5 times 1, which is +0.00R. If each trade also costs 0.1 R in spread and slippage, the expected result is -0.10R per trade. A signal needs an edge larger than its cost before it can add anything. See expectancy.
How it hits bots
- Alerts wired to orders: if an indicator repaints and its alerts are connected to a bot, the bot may act on a mark that later disappears. See TradingView alerts.
- Backtests of indicator rules use the finished chart. A repainting rule can look profitable in the test and fail live. See look-ahead bias.
- Stacked indicators: using several from one package does not make independent evidence, because they are all built from the same prices.
How to check an indicator yourself
- Watch it live on a demo chart through at least several bars and write down each mark when it first appears.
- Compare that list with what the same chart shows after the bars close.
- Test the same settings on a different asset and a different period.
- Add a realistic cost to every signal before judging it.
- See demo account and paper trading for ways to do this without risk.
What to verify on the vendor's current pages
- Whether the vendor states which indicators can change marks after they appear.
- Which platforms, markets and time frames the package supports.
- The current plans, what they cost and the refund and cancellation terms. Note the date you read them.
- What results the vendor shows, over what period, and whether they include costs.
- What the terms say about losses and about trading decisions being yours.
What this page does not tell you
It does not say whether the package works or not. We have not run it, and it states nothing about its prices, features or results. It says how signals on any chart can mislead and how to test them. The numbers are made up and nothing here is a recommendation.
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FAQ
Frequently Asked Questions
What kind of product is Lux Algo?
In general terms it belongs to the class of charting indicator packages, which draw signals on a price chart. We have not run it, so check its current pages for what it contains.
What does it mean when an indicator repaints?
It means a mark can move or disappear after it was drawn, so the finished chart looks better than what you would have seen live. Recording each mark when it first appears is the check.
Is an indicator the same as a bot?
No. An indicator draws marks from past prices. A bot also sizes trades, places orders, handles costs and applies stops.
What should I check on the vendor pages?
Which platforms and markets are supported, the current plans and terms, whether any indicators can change marks, and what results are shown and over what period. Note the date.
Can using signals like these lose money?
Yes. Past or simulated results are not a guide to future results. You can lose all the money you put in.
Are the numbers on this page real?
Example numbers are made up to show how the maths works, and the page says so. A figure only counts as exact when the page says it was calculated on a stated date. Nothing you enter in a calculator leaves your browser.
Can I use this to decide whether to run a bot?
It can show whether a bot's numbers hold together and how much an account can lose. It cannot say what the market will do, and it is not advice. Use it to ask better questions, then read the terms of your own broker or exchange.
Is this financial advice?
No. It is general education. All example numbers are made up and nothing here is a recommendation to use any product.
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